Thread: Mystery Gauge
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Old 09-20-2023, 05:54 PM   #8
MikeB
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Join Date: Jul 2000
Location: North Texas
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Re: Mystery Gauge
Quote:
Originally Posted by Wrenchbender Ret View Post
Be sure you have the correct sending unit. Chev. changed the ohms value on their temp gauges in about 1978.
George
The ones I have are supposedly correct for a 69, and cross over to an ACDelco G1852.

I found a chart on the Internet last year showing the resistances a guy had measured for 5 different brands, including his original GM, a new ACDelco, and three others. Resistance values were all over the place. For example, at 180 degrees the senders measured 123, 125, 135, 140, and 160 ohms, with the original and new ACDelco being the farthest apart! So, odds are whatever I buy will be different than my OE sender/gauge combo.

In any case, I'm going to test a couple senders and my new gauge on the stove top. Just need to get a good 0-250F thermometer.
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Mike
1969 Custom/10 LWB -- owned for 37 years. 350/TH350, 3.08 posi, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. Hedman stainless headers. Old Air installation in progress.
1982 Custom Deluxe 10 SWB -- converted from 250-six to roller cam 350 w/ Vortec heads -- sold
1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it!
1969 C10 (not the current one) which I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
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