Tempature Gauge Problem with Rally Gauges

Q: Temperature Gauge Problem with Rally Gauges

I’m having some problems with my Temp gauge. The rally gauges were redone at some point before I got the car by a reputable shop. But the Temp gauge jumps as I start the car but then goes to the cold side and stays there when running. I haven’t tested or changed the sending unit yet… Other than that, any suggestions?

A: I experienced this very problem when I installed my rally gauges. There’s a wire that goes to the ignition that was used to test the idiot light for temp when you started the car. I didn’t disconnect it at first, and it caused my needle to peg when starting the car. It eventually got stuck. After I removed the wire, the problem was gone. Cutting this wire is mentioned in the FAQs for rally gauge install; I don’t remember the color (maybe green) but its the only connection on the harness that had two wires going to one point. I ‘ll dig into my notes at home if you’re still stumped. Sounds like maybe the shop didn’t know this little detail.

A: I got under there last night and double checked all the connections and found something similar. My needle would peg on start up.. anyway checked everything and it seemed like the sending unit was part of the problem as mentioned in the FAQ’s… After leaning all the contacts for all the wiring and replacing the sending unit with another unit for a gauge, it works! YESSS!

And stays about 190-200 even under hard throttle this morning! But this afternoon will be the test… even up here in Seattle it will be about 75-80 today… Gotta love that and a convertible too! Life is good! Now if I can get my Hood Tach figured out I’m golden!

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