Compression Ignition Addict
Join Date: Aug 2007
Location: New Martinsville, West Virginia
Thanked 54 Times in 52 Posts
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The backlight should come from the dash light circuit, and in no way should affect the gauge operation, and also doesn't indicate that there is power to the gauge where it needs it. The gauge should have the thermocouple (yellow and red) that goes to the probe, and also have (at the gauge) key-switched power and a ground. I am going by memory, it's been a few years since I hooked up the gauges in my yellow truck, and haven't done it in my red truck yet... however, I can look at my new gauge sitting in the box in the garage when I get home... it's an Autometer...
'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD
'00 F350 extcab, 9' utility bed, dually 228k
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E'99 F250 extcab, S/Bed 211k. Sidelined due to motor issues.
'00 Excursion Limited, 7.3PSD 294k
'84 Chevy K-30, 6.2L TD, woods/trail beater. 141k