Willcox has a diagram that shows which connector is which on a temp gauge, which you may find helpful.
http://repairs.willcoxcorvette.com/corvette-temperature-gauge-testing/
I had found a youtube video on troubleshooting a C3 Corvette temp gauge, but I can't find it again now. It did show some common problems and what was causing them. My temp gauge always stayed around 100 degrees, and the video indicated that an insulator on one of the connection posts may be bad. Haven't had time to pull it and check yet.
I found the troubleshooting video for the temp gauge: https://www.youtube.com/watch?v=A9iPeiu9Y8M
|UPDATED|8/22/2018 6:20:43 PM (AZT)|/UPDATED|
______________