Inaccurate Rally Gauges

Q: Inaccurate Rallye Gauges

I have recently added a set of temp/volt/oil gauges to my 1969 350 and am now curious as to what normal operating temperatures I should be shooting for (now that I can actually see a numerical reading rather than just an idiot light). I keep getting readings that are all over the place. Is this indicating something is wrong with my cooling system or my new gauges?

A: Good luck on your gauge conversion, hope you changed the sending units to the GM ones. 69 are easier than 1967 or 1968 no need to redo your complete wiring harness like the earlier years,they finally wised up. Given the inaccuracies of stock senders, youll be lucky to tell what the temp is. I recently took about 6 GM oil pressure senders and pressurized all to the same. None were even close to each other. Static pressure readings are even way off. This was pretty much the norm for factory gauges. If you want to accurately read temp then use a good mechanical gauge along with your factory one and compare. If the two are close then remove the mechanical one. If not then note the differences and use the true readings of the mechanical one . You can test the operation of your thermostat by heating in a pan of water along with an accurate thermometer it should fully open within a few degrees of advertised or spec ed. Your car should run a few degrees within the thermostat with everything in proper order. Check past posts for cooling tips

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