So while I'm patiently awaiting rain today I decided to do some research on our gauge cluster.
I have an older (or at least less popular) cluster that holds tach, temp, and oil pressure. Not the lights that seems to be more prevalent. These are also wired to an alarm.
I'm looking for two things. 1, test voltages from senders. (I think they're 5VDC to 12+ but I'm not sure) and 2, A way to rule out faulty gauges.
The engine overheated due to a small coolant leak that I have to also troubleshoot. The alarm works, but the gauge does not. Oil is ok, and the tach is sticky.