New impeller, backflushed everything, blew air through the water line from side of block to water gauge, ran motor, water is going through water line. I am wondering if the gauge is shot.

sounds like it i had problems with one before

Blow 30 psi of air into the connection on the back of the gauge and see if it moves and reads properly.

well... i would suggest that if you blew high pressure air into that line without disconnecting it, then that gage has gone to gage heaven.

Thanks for the replies everyone.