It seems to be getting hot to the touch and just barely registers a temp change after the engine is warmed up. I haven't checked a thing yet, but thought I would ask for input. Thanks all...is it Friday yet?
My car does the same thing. The stock temp gauge barely moves when the car's warmed up. I just bought and installed a CHT gauge, and it seems to be pretty accurate. It will get up to 325 before my stock gauge does anything.
http://www.cbperformance.com/catalog.asp?ProductID=1198
That sounds like a typical gauge/sender mismatch (or a failing sender or gauge).
The gauges/senders were for the most part matched. I know between 1973 and 1974, they changed gauges (moved the red mark to give the needle a broader swing before it got to the red area), and they also changed senders. The 1974 had more range (the needle moved more for a given temp).
I think the real change was the sender.
On another note, I briefly had 2 gauges wired to the same sending unit and both gauges displayed almost exactly 1/2 what they should have.
The wire to the senders get brittle from engine heat. The voltage does not pass as it should, therefore the temp will be off. In the telephone business we have what are know as High Joints. They let the signal (voltage) pass but it causes distortion. The wire is making intermittent contact because the voltage is jumping the small opening. The insulation of the wire is what holds the wire together to complete the circuit.
As for the difference in the guages, the temp scales are identical when you look at the range printed on them when you take them out of the case. The red lines are different though. The senders start and end at different temps.
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