Sunpro Electric Temp gauge

[48bill]

Recently installed an electric Sunpro temperature gauge in the 48 Chev.  It seemed to work well for a few rides and now is way off.  I noticed on imediately starting the car it was at 100 degrees.  It quickly rose to 190 degrees and there it stays even after sitting for a day or more.

Is there a way to test to see if it the gauge, sending unit or wiring?

Thanks for the help.

[Charlie Chops 1940]

Poor grounds usually give false low readings, Did you use thread sealant as opposed to thread tape(which gives a poor electrical ground)? I suspect connections. If all checks well send Sunpro an e-mail or call their tech line.

Charlie

[Rrumbler]

I'm with Charlie, that was the first thing I thought of.