Fuel Gauge - Potentiometer - John Z !! - Team Camaro Tech
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post #1 of 5 (permalink) Old May 20th, 04, 07:08 AM Thread Starter
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I wanted to test my fuel gauges using a potentiometer method as you described in a prior Team Camaro post. I went to the Radio Shack web site and they have ten different potentiometers. Can you tell me exactly which one I will need to do this test. My fuel gauge is the last piece of the puzzle I am trying to solve and it's driving me crazy!! The Radio Shack site is below,,,

Radio Shack - Potentiometer

'68 Camaro Convertible

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post #2 of 5 (permalink) Old May 20th, 04, 09:28 AM
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I'm pretty sure that the fuel gauge sender is only about 160 ohms or so from full to empty. A 1K pot should work just fine. Radio Shack's 271-280 1K, 1 turn trimmer pot should do the trick. If you want a lot of resolution, use the 271-342 1K, 15 turn trimmer pot.

Paul D.
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post #3 of 5 (permalink) Old May 20th, 04, 11:06 AM
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GM fuel sender is 0-90 ohms. 0 is empty, 90 is full.

Mark Canning
1969 Indy Pace Car
350/300HP RPO Z11

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post #4 of 5 (permalink) Old May 21st, 04, 11:33 AM
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A 100 ohm linear taper pot would work fine. 1K ohm would work as well, but you'd only be using 10% or less of its range.

68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #5 of 5 (permalink) Old May 22nd, 04, 04:06 PM
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Exactly - you want a 0-100 ohm linear taper pot; it doesn't show on their website, but it's in the big catalog in the store. Mine is ink-stamped "B100" (followed by the ohm symbol) on the back, cost five bucks, they had to order it. Here's a pic of mine - you tie either end tap to the center tap and add two wires, and you're in business.


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