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for my pre turbo egt... i took out one of the heat shield bolts, drilled the hole bigger without breaking through (the hole is already fairly deep and you can see what you are doing if you take your time and check often), tapped it in the same fashion, started the engine and with a smaller drill bit (a bit bigger than the probe) drilled through, and got showered in metal bits...
trans temp... put a hole in the pass side bottom of the pan, went to auto zone and got a add a drain plug kit, drilled and re tapped the center hole to fit the sensor and installed (i get the same temp readings as RT)
boost there is a few bolt places that are tapped but not used... did the same as for the EGT...BUT... the second hole i drilled was tiny and the flutes were packed with grease AND i DID NOT START the engine.
hope this helps and if you want pics let me know
edit.... every time i checked the hole for depth and thread quality i blow the hole out with compressed air to keep it clean.. and with the harder cast iron of the exhaust manifold, doing it this way, if you break a tap off there are no worries cause you didn't get to drilling through yet so no holes.
_________________ Trevor
'05 Limited CRD Inferno Red Pearl Coat
Home made provent installed @ 35443, SEGR installed @ 35466, Fumoto valve @ 37500, trans and transfer case skid, In tank pump installed @ 43500, Suncoast TC & Transgo Shift Kit @ 44730, EGT, Boost, Trans temp gauges, Samco hoses, Rebuilt Trans w/ HD454RFE kit @ 56K, Inmotion Stage 2 @ 56K
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