Greddy Oil Temp Gauge Probs

[StuiE]

Have got a GReddy oil temp gauge that came with my car, the sender and the

power etc were all wired up before I got it, problem is, it doesn't work.

I've double checked the wiring, works perfect. I'm thinking there is a problem with the guage itself, as the needle is stuck right over at max, weather it's plugged in or not, the needle will jump 'down' (anticlockwise) as you start the engine, but then return instantly, then does it again as you turn ignition off. Going by other pics of them I've seen, they ain't meant to be on max when untouched.... as seen here.

common problem/easy fix at all? or do I have to get other one of these things..

[Duncan]

I don't know if this is the same, but some water temp gauges go to max when there is no input - the idea being if you loose all your coolant the sender would only see ambient temp (say 20o) but the car is actually cooking. When you plug the sender in it shows the right temp instead.

[StuiE]

I was thinking that at first, but when I plugged her in it says otherwise. I've had a multimeter on the sender wires and resistance changes with temp, so that's all good.

I've tried opening it, there is two cap screws on the back, but she won't budge

[GTshortie]

I had a similar problem with my oil temp guage, but not the same my needle would stay on the other side of the stopper of the 30degrees. then when i drive and the oil temp moves it stays there til i hit 110 on track and sometimes go back to normal.

SOLUTION: i went to jaycar and bought two very small and SUPER strong magnets i mean REALLY strong.... small but if your finger was between them or would snap your figure off no joke it was around $15-$30 for the needle. Just got a cloth put the magnet to the guage and moved the needle back to the normal position and all was sweet.

Pm me if your in sydney and want to meet up and borrow the magnet

[StuiE]

Thanks mate, I have some half decent magnets at work, so I'll give it a shot tomorrow.

I'm in Perth, so can't exactly borrow yours, but thanks anyway!

Edited September 10, 2007 by StuiE

[StuiE]

It worked!

But if I plug it in and turn ignition on it'll go to max again! if you leave it on ACC or have the engine running and plug the guage in it'll show the proper temp....

done some more multimetering, the wire that's meant to be only powered on ignition is powered on acc too, so hopefully that is the underlying problem.

[infamous_t]

Got the polarity (+ and -) of the sensor the right way around?