Some time ago, I had asked in the middle of another thread whether it would be possible to piggyback the signal wire from the stock oil pressure gauge to an aftermarket sending unit. It was relevant at the time, but don't think it was ever answered...so I'm asking it now.

I've looked through several wiring diagrams and other manuals and didn't see anything specific...but I was looking for the voltage range that the stock gauge expects. I'd imagine that it's 0-5v which I believe is the same for most aftermarket units.

I have a Defi D series oil pressure unit. I, as most do, am experiencing issues with the stock unit. Yes, I know, I could just replace it, which is what I may do if this doesn't work, but I figured consolodating is better.

So the question is can I just tap into the defi unit, or do you think the amp draw would be too much and kill the sending unit? I would just plug the stock sending unit's hole. Has anyone else done that? I would like to replace the stock gauge altogether, but have no idea what I'd put in its place. Guess the only thing I don't have yet is a voltmeter.

Thanks!

Christian

 

2 obvious answers, one on the back of the gauge, two at the sensor itself.

Next, chances are your defi gauge is not compatible with the stock sending unit, an FC gauge pack is not compatible with an FD sensor, even though the sending units very similar externally.

 

I don't follow. All the sending unit is doing is sending a signal (some varying voltage) to the gauge. All I'm talking about doing is tapping into the wire.

 

voltage...the only sensor that does that is the O2 and even then its less than 1v . temp is resistance...so theorethically you can trick it by using a sensor that reacts to temp changes with the correct amount of resistance the ecu expects...so unless you have a stock sender or the aftermarket gauge matched to the stock one its not working. at least not accurately.

I think thats how it goes...right?? all i know is it cant be voltage. lol

do what i'm about to do and spend the $100 or so and get a new stock sending unit