Temp Gauge

[dcpetty]

Here's the deal...I'm running vortec heads with a stock water temp gauge. The gauge is ok because it pegs out when I ground it. I have a '96 chevy truck sending unit screwed into the head because the stock one is too large. My gauge is barely registering even when I know the engine is on the high side of operating temp (boy that was fun heating it up). Anyone having the same problem with vortec heads and stock temp gauge??