Oil temperature sender

thermorex · **Posted:** Mon Jun 30, 2014 7:27 pm

Hey guys,

Now that Seth's kit (weeks101) for gauges came in the mail, I would like to ask you what location would you recommend to install an oil temperature sender? I plan on installing the oil pressure in the location suggested by Geordi in the tech forum (below turbo), using an oil hose and adapters, so it will no be exposed to vibrations and also simplify the installation, I just can't think of another place than that to install the oil temp sender. Do you have any suggestions? I can use a tee adapter in which I can put both oil pressure and temperature, but I'd prefer a different location, such as bottom of filter where the oem pressure sender for idiot light is.

What do you guys think?

CATCRD · **Posted:** Mon Jun 30, 2014 9:57 pm

I would either tee in with the OEM pressure sensor or drill and tap the oil pan to get to the sump.

65Corvair · **Posted:** Mon Jun 30, 2014 10:01 pm

Having it mounted down by the idiot light I think would be the best place for the temp gauge. Ideally it should be mounted in the direct flow of oil to get the most accurate temp reading. Adding a "T" down there is probably is as close as you can get.
You would not want it mounted on the remote branch because it will measure the temp of the stagnant oil sitting in the oil hose, essentially the temp of your engine compartment.

thermorex · **Posted:** Mon Jun 30, 2014 10:58 pm

Makes sense, thanks guys. Do you know what thread is on the idiot light sender? I think also making a hole in the pan is a good idea.

papaindigo · **Posted:** Tue Jul 01, 2014 9:25 am

Comments:
1. 65Corvair said what I was going to say to the effect that the sensor needs to be "in" the flow of oil not way off to the side. The oil pan is a good place but I don't see how one could be securely mounted there without dropping the pan which is apparently not possible without pulling the engine. Alternatively there are 2 other plugs in the same gallery where geordi and I worked out an oil pressure sensor location but a) the other 2 are not easy to get too and b) the sensor would have to be at the plug location which adds to clearance issues.
2. a "T" off the OEM pressure sensor location, it's pretty obvious right down next to the oil filter, would do. However, I wonder, not sure I'd recommend doing this, would there be any harm in simply replacing the OEM pressure sensor with your temp sender if and only if you are adding an oil pressure sensor in another location. You are not losing your oil pressure reading rather you are losing the idiot light. I toss this out there for what it's worth with the caution that IIRC MrMopar64 has said that the OEM pressure sensor actually records, although it's not displayed on the dash, oil pressure. As such I do not know if that real oil pressure reading is "used" for anything else than triggering the dash warning light.
3. thermorex - let me know what oil hose you use to remote locate the pressure gauge. I'm thinking of doing a remote location to and would like to benefit from your decision.

thermorex · **Posted:** Tue Jul 01, 2014 10:37 am

Thanks Jim, I thought about unplugging the oem pressure sensor/idiot switch, I am not sure if i won't create some computer gremlins... Maybe I should just unplug it and drive around without, to see what happens, but I'd suspect an oil light on. Maybe to put some sort of resistor in there to trick it?

I will definitely let you know how the project will go, i plan in fact to create a thread in the tech forum about adding gauges in general, I already have pics for the EGT and Boost, but waiting on oil sensor installation. It may take me a bit, I'd wait to replace the turbo also in the same time I install the oil pressure sensor, since both need to be done and it would be way easier to do them together.

I already got the fittings and hardware for the oil pressure, this is the PTFE hose I got, it has a braided stainless steel cover and I think it is a good fit for what I want:

http://www.summitracing.com/parts/sum-220990

papaindigo · **Posted:** Tue Jul 01, 2014 10:59 am

I certainly don't know enough about electronics to be sure but:
1. I suspect unplugging the OEM sensor would trigger a CEL. At least logically one would design the system so no signal would be interpreted as no oil pressure but...
2. if, as I noted, the OEM sensor provides "real" oil pressure data to the computer I wonder if the computer "does" anything with the real data other than turn the oil pressure idiot light on/off based on some psi threshold. Perhaps Keith at GDE or MrMopar64 can address that issue and the next one.
3. in a real reach I wonder what would happen if you installed a oil pressure sensor in the upper gallery and sent that sensor's psi data to BOTH a "real" oil pressure gauge and wherever the OEM sensor sends it's data. Perhaps that would keep the low pressure idiot light off and free up that OEM oil pressure sensor location for a oil temp probe without a "T". I can almost hear the chainsaw running on the limb I'm on between me and the tree but it's a thought worth considering perhaps.

65Corvair · **Posted:** Tue Jul 01, 2014 1:21 pm

During my head gasket replacement someone reccomended this hose. I do not like it beacue of the number of fittings at the end of each end of the hose. (potential leak points)
http://www.maperformance.com/ams-remote-oil-pressure-sending-unit-line.html?utm_source=google&utm_medium=Product_Search&utm_campaign=google_base&gclid=CJO5npaQ7bwCFW3NOgod1RwA4A

For the OEM pressure switch/sensor you could add a "T" to the end of the hose and have both pressures measuring off of that port. Then you would be free to add the temp sensor down below. Rerouting or modifiying the harness may be nesseseary with OEM relocation.

papaindigo · **Posted:** Tue Jul 01, 2014 2:09 pm

I looked at that one also but have not checked to see if the 12" length would be adequate to handle clearing all the "stuff" in the way of the rear oil gallery plug and a remote mounting point. The potential of fitting leaks does not worry me. If 12" is not enough there are longer units.

thermorex · **Posted:** Tue Jul 01, 2014 2:17 pm

I'm not concerned about leaking either, I'll make sure it's properly tied and monitor constantly.

Do you guys know the size of the oem sender at the oil filter?

65Corvair · **Posted:** Tue Jul 01, 2014 8:43 pm

Based on the thread here I assume you can use a 1/8 NPT Street T.

http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=51119

In Geordi's oil pressure gauge hot to thread on the tech section, Mr Mopar 64 says its a pressure sensor and not a simple pressure switch.

http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=98&t=74754

thermorex · **Posted:** Tue Jul 01, 2014 10:32 pm

Great, thanks a lot, appreciate the info. And duh... Just read the thread with Mr mopar and I forgot that info...

I may in fact go ahead and install the temp sensor this week, since it seems to be a breeze. And I get to use weeks101's gauge panel, lol.

mass-hole · **Posted:** Wed Jul 02, 2014 10:24 am

Is there any reason why no one has used one of these for both the pressure and temperature senders? This will keep you right in the flow of the oil directly after it comes out of the pan.

http://prosportgauges.com/oil-filter-adaptor-plate.aspx

Im pretty sure our jeep is a 3/4 - 16 thread since the Ford Windsor filters fit.

papaindigo · **Posted:** Wed Jul 02, 2014 10:54 am

Interesting item. The one downside that comes to mind is that it adds to the length of the filter which might cause ground or skid clearance issues especially if you use the large size filter which is already longer than the stock size filter.

thermorex · **Posted:** Wed Jul 02, 2014 11:01 am

mass-hole wrote:

Is there any reason why no one has used one of these for both the pressure and temperature senders? This will keep you right in the flow of the oil directly after it comes out of the pan.

http://prosportgauges.com/oil-filter-adaptor-plate.aspx

Im pretty sure our jeep is a 3/4 - 16 thread since the Ford Windsor filters fit.

To be honest I thought about a sandwitch plate, and I think it is a very good idea. Usually they are used for an additional oil cooler, but I can't see any reason of not working for gauge ports.

mass-hole · **Posted:** Wed Jul 02, 2014 11:03 am

papaindigo wrote:

Interesting item. The one downside that comes to mind is that it adds to the length of the filter which might cause ground or skid clearance issues especially if you use the large size filter which is already longer than the stock size filter.

I just got my nifty new vent gauge pods so maybe I will try this out and see and post up some pictures.

I know my jeep doesn't have full skids so the filter is pretty much 100% exposed as it is. I do have an Amsoil bypass unit waiting to go on though so that should make this irrelevant eventually.

weeks101 · **Joined:** Mon Jul 30, 2012 3:29 pm **Posts:** 747

mass-hole wrote:

http://prosportgauges.com/oil-filter-adaptor-plate.aspx

The sandwich plate method would be my recommendation.

65Corvair · **Posted:** Wed Jul 02, 2014 1:19 pm

If you were to use a sandwich plate, you could use this one. It only has 1 hole and its 1/8 NPT.

http://shop.perma-cool.com/161-Turbo-Oiler-Adapter-3-4-16-thread-161.htm

thermorex · **Posted:** Mon Jul 07, 2014 9:37 pm

Mass-hole, I need to buy you some drinks! I went and got the sandwich plate you recommended, fits like a glove and you can add 4 senders, at least theoretically (not sure what exactly somebody needs other than pressure and temperature but who knows...). Thank you very much for the idea! And also thank you guys for giving me ideas. After talking to Ranger1, that also has the sender for both pressure and temp where the oil filter is, I agree with him totally that there isn't much difference in having the pressure sender where the oil filter is vs the location Geordi prefers (turbo side vicinity), since once you run out of oil, it will be pretty much no difference in pressure in either location.

Regardless of personal opinions, this is how the prosport sandwich plate looks like installed :

Fitting for m1-211 oil filter (the stock size):

There is a good 1+ inch left in between the filter m1-211 and closest point on Trans shield, I think the super-sized filter will also fit.

One note, this sandwich plate is not made the same way the traditional sandwich plates that are used for oil coolers are, the filtered oil is freely moving through, it is not routed through a specific outlet, this one is like a filter extension, meant specifically for additional gauge ports, sorry, didn't think to take some pics... Edit: it looks like the one Corvair posted.

Oil temperature sender

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