oil psi guage doesnt work
 

ive tried a couple things so far. first thing i did was replaced the gauge. no luck. second thing i did was replaced the oil psi sending unit. still no luck. so at this point im kind of at a loss and dont know what to try next.

check for ground and or power. get a voltage reader or multi reader and start checking. Start from the dash wires all the way down to the battery, fuses etc...

how and or where would i check for ground and or power? and is there a fuse somewhere for this?

You can test that gauge and wiring by sticking a 100ohm resistor between the signal wire and chassis ground. That should peg the gauge. Similarly, you can momentarily ground the wire and see if the needle moves. Take care not to leave it connected as it will destroy the circuit. But to be clear it's just the oil pressure not working, correct?

right...oil psi. when the car is off the gauge lays down like the rest of them do, and when i start the car all my needles come up like normal but the oil psi one just keeps going and pegs out

Likely you have a short to ground somewhere. I think there is a capacitor that is connected in that circuit that lives under the hood. Maybe it fried and is now shorted?

do you have any idea where that might be located at?

It's actually a condensor and looks like a single wire terminating in a little black cube with a bracket.
It's supposed to be bolted to one of the slave cylinder bolts on the belllhousing but tends to migrate over the years.

The gauge will work fine without it but the wire (if broken) must not touch ground or the gauge will fry.

Mine was hanging loose after a transmission rebuild. Noticed no change with the gauge when I reconnected it.

I've always wondered what exactly it was for. The circuit seems fine without it.

ill go searching for this ground as well. thanks for the help so far guys

Condensor=capacitor

If it is hanging, it'll be on the driver side not too far from the oil pressure sensor.

i wasnt able to locate this damn thing. are there any picture references if possible?

this is why stance culture shouldn't be mixed with car culture.

It is to damp fluctuations in the gauge response. The gauge will work fine without it, but the wire has a habit of grounding out which will cause the gauge to peg and then eventually fry.

Post #22

https://www.rx7club.com/2nd-generati...cs-inc-857362/