R34 Gtt Oil Temp Gauge Not Working

[Jayden.K]

As above my gauge dosnt seem to work. It's lowest temp reads just under 50deg and I'm quite confident it gets higher then that. This car has a aftermarket gauge and it it has a red, black, yellow and green wire. now I'm sure the red an black are illumination power and earth for the gauge. The green is taped up ( not connect) and the yellow is spliced it to the original loom. And by guess my sensor is on the oil filter plate and it only has one wire. But I'm sus about the green with that's not in use and really want to know what each wire does so I can test it. Cheers

[Moodles2]

red positive, black earth/ground, green I'm guessing would be illumination/dimming when headlights/parkers are on, yellow would be the signal wire. Probe the yellow wire with a multimeter at the gauge to see if there is any voltage signal (or resistance whatever the gauge uses), and probe at the temp sensor itself. Either gauge is dead, temp sensor is dead or the wiring inbetween is frayed.

[Jayden.K]

Ok so using continuity check I found the wire going off the sensor to the connect that went to the original gauges. So I connected the signal wire from the gauge to this wire that leads to the sensor and nothing. I earth to signal wire straight to ground and see if the moved the gauge and the needle just flash and didn't move. They are stir x-line gauges. So I have no idea why it doesn't work. So is there a chance now I have a dead sensor or gauge?