I have a small leak at the oil tube between the block and the turbo. I do not know if there is a oil pressure sensor at this location. It just looks like a fitting and tube up to the turbo. I looked the FSM and it should be easy to find but it is not clear to me.
Questions, 1) is there a sensor at this location?
2) Should I have the line/fitting replaced or is it possible/likely that the fitting can be removed and teflon (or other sealant) used to secure the fitting? If replacing what part do I order?
3) It seems really hard to access the fitting. How much needs to be removed to reach the fitting? Are there any tricks to reach it?

Which one?

The big tube is the oil return line that's gravity fed more or less and it just pushes into a rubber grommet in the block. May weep a bit of oil at the block but there is not much of a fix as the grommet isn't much of a seal but any weeping at that point is harmless.

The skinny tube is the oil feed line. At the block end there is a fitting plug that threads into a port in the upper oil gallery, could be leaking around the threads of the fitting plug if it's a shade loose (there is a copper crush washer there), and something like a ball/socket joint at the end of the feed line that fits into the fitting and is held in place by a "nut" on the feed line (see the part picture at idParts), could be that nut is a bit loose. The next to last pic at viewtopic.php?f=98&t=74594 shows the fitting. To get in there you like have to remove the heat shroud and maybe the vacuum tower behind the air filter.

There is no oil sensor in there.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Thank you,
you and the folks on this site are remarkable. Its the pressure line, I ordered a new line from idparts. Fortunately it is a very slow leak and I now have some idea of what is involved in getting it on.