Temp gauge problem. - Team Camaro Tech
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post #1 of 2 (permalink) Old Apr 30th, 19, 06:37 AM Thread Starter
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Temp gauge problem.

I have built a 69 with a LT4 for a customer. Everything is good except for the console temp gauge. It's using it's own OEM type sender, which causes the gauge to peg out on the high side because the LT4 normally operates at 200-215¬į. How do I correct this?
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post #2 of 2 (permalink) Old May 1st, 19, 05:10 PM
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Brian
 
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Exclamation Re: Temp gauge problem.

Catfish - If it is an original AC/DELCO or a CHQ original style replacement gauge they will be using a resistance card between the terminals to correct the gauge. The AC/DELCOs used a mylar card that had a wound by hand wire resister that was calibrated for that particular gauge at the assembly plant. The Classic HeadQuarters replacement gauges used to use a ceramic filter as resister. Now all CHQ and always the OER gauges had internal resistance methods built right into the unit.

So the question is, was the card damaged or removed, ceramic missing or damaged and that's why your pegging hot, or not.

Bottom line is get a potentiometer zero to 100 Ohm's and put it in line and adjust with hot engine to the point where you want the needle to reflect normal operating temp. Then do not touch the potentiometer but carefully remove it and then read Ohm's through it at that setting to determine the amount of resistance you need to add to the gauge to calibrate it for the new engine. Then buy that amount of resistance, maybe even if you are lucky in one resister or by combining multiple resistors in SERIES to get the end result desired.

And yet another solution is to just leave the potentiometer in line and as long as no one get to it under the gauge pod and adjusts it.... but resistors in series is the safest bet for it remaining corrected.

As to if the unit already has a resistor...one school of thought is remove it and calculate new total resistance, then in the event the old wire resistor rust or breaks, your not chasing your tail. While I've never known a ceramic resister on a CHG gauge to fail, well everything is possible.

Brian


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