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what adapters do i need to retain the factory oil pressure and temp gauges in my 93 k2500 the engine is out of an 04 yukon. id really prefer not to drill and tap anything since the engine is already in the truck and it seems it would be a pain to do. the adapter i saw for oil pressure eliminates the 5.3 sensor dosnt the 5.3 ecm need it to work poperly?
Good question and on the subject does any one know the drill and tap size for the temp sensor? I belive its 3/8 npt but I am not sure
Tap the block off plate above the oil filter to 1/8" NPT and install the oil pressure switch there. There should be enough wire in the harness just take the tape off of it. You can get a temp sensor adapter from Welcome to Street and Performance
Hope this helps.
so you do need to run both oil pressure sensors?
Yes, one runs to the pcm and the other from your old engine will go to your gauges. this is the same on the temp and oil pressure.
ok seems red told me I only need one, I broke the one off the 5.3 and he told me to just drill and tap the broken piece for the one off my 5.7
You can still do that if you wish, it will work either way.
If your sensor is 3/8 NPT then you'll need a 9/16" drill before tapping. That one would not fit the block off plate above the filter without some kind of reducer.
How can I do it either way I though I had to have both on up to and one at the blockoff plate?Quote:
Originally Posted by NITROUS
You can put a Gen3 oil pressure sending unit in the stock place at the top of the block and hook it up to the new Gen3 pcm and also have a sending unit installed into the block off plate above the oil filter hooked into the factor oil pressure wiring.
Greg, the drill bit for 3/8-18 NPT is actually 37/64" LOL I was wondering how you get the signal to the PCM using just the vortec sensor on the 5.3 without running wires to it. It would be much simpler to run both sensors. I thought Greg just used 1 sensor, sorry for the confusion.
I do use just one sensor. The PCM doesn't throw any codes if you don't have oil pressure. Imagine that! I would have thought it would light up every light on the dash should you have zero pressure. :nutz:
This is the tap drill chart I used Lance... NPT Tap Drill Sizes - Engineer's Handbook
It seems that is the size you're supposed to use if you have a tapered pipe reamer. Works good with a hand drill too since most guys wollar a hole out as they drill, can't hold a drill straight and square ( me included ) :laugh:
So I am ok just using one sensor?:ugh2:
Ok, you got me there! We don't deal with too much straight pipe in our shop, mostly tapered. :doofus:
"So I am ok just using one sensor?:ugh2:"
I'll let Greg answer that one since I run 2.
Quote:
Originally Posted by NITROUS
My head hurts....:hyper2:
I run just the one sensor mounted in the stock location. Thats just me. If you have the wiring there and feel like buying a new sensor, do it. Its all pretty much personal preference on if you use one or two sensors. For the sake of argument you could just install both of them and then there will be no doubt that the PCM is getting the oil pressure information, even if it does nothing with it. I guess I should go hook the HPTuner cable to the truck and see what PSI it shows the oil pressure at when its not hooked up, probably maxed out at 99 PSI or something.
ok sounds good to me ill just pick up the other one just in case...