Had a Thermostat go last season...replaced it with another one and now I don't have a good reading on the gauge, it stays below 100 degrees. The gauge is working, if I short it...the gauge pegs out. Got any ideas?

Maybe the Gauge is stuck open ?

I think the gauge is fine it just does not register when the tstat is hooked up. When I touch the gauge wire against metal it pegs it out which tells me the gauge is working.

It is the sender.You can try taking it out and putting it in hot water to see if it makes the gauge read.But for $8.00 it is not worth all the trouble.

ah forgot to mention....did that as well, replaced the sender as well as the tstat.

My bad ... I meant the thermo could be stuck open ...take it out and see what temp does

That's my bet . Had that happen to me

Did you use the Merc t-stat gasket????

It has crush rivets in it that act as a ground for the sender. Also, you if you use sealant on it or it won't ground properly either.

it does have the merc gasket.....I did put sealant on it. guess the next try would be a new gasket w/ no sealant.

Got to have the rivets or the gauge won't work.