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Re: 50 years ago I was given this USAF 54 3100
This is the item on amazon
OLLGEN Multifunctional 4 in 1 Car Digital Clock in/Out Thermometer Voltage Monitor with Stand and Magic Tape.
Temp sensor was run over to the pass side, thru a grommet and down fender to under running boards. Very easy. very accurate. Has green and blue backlights. I like blue. Had a previous version for 20+ years. It still works but only a black display. I already had a dual plug outlet hidden under dash so power was easy. At 12 bucks its the cheapest voltmeter alone you'll ever find.
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