a wierd gauge issue on 1994

[Marv D]

Thanks, but its not a 'warmup 'thermostat spike,, this just started a month ago and I built the RHS vortec head 383 roller motor for it like 9 years ago. Has never done this 'spike before.

I'm absolutely with you on the vortec heads and the stock 94 heater hose routing. I used a GMPP TBI intake and had it bored for the Holley throttle body. Finding a heater hose routing that does not bypass the thermostat is 'challenging' aint it!!

Guess I'll replace he thermostat even though the T-stat housing never even gets over 170 when the 'gauge' shows 240+

I'm just at a loss why it would 'sweep' to hot over 30 seconds, then sweep back to 170. A short to ground and it peggs isntantly, unplug it for open circuit and it goes to 0°

All I can come up with is all of a sudden ts developing steam pockets in the head at the sensor, or the gauge is just STUPID.

Oh wait,, heres an idea that should at least solve if it IS getting hot spots or not.... Maybe I'll put a mechanical gauge in the head in place of the sensor and just see WTH..

Does anybody know of a competant party to rebuild the 94 dash cluster and test the circuits and all???