Erroneous Temp Gauge Reading - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**425HP409** · 04-20-2024, 09:22 PM

I finished the install of the 396 in my truck and installed a new temp sending unit. I also installed a new LMC temp gauge that has temp readings from 100-250 instead of the original gauge that reads cold and hot. The temp gauge only reads barely off of the 100 line when the engine is at operating temperature. I checked the gauge by opening end shorting the sending unit and the gauge responded correctly. Anyone have this problem with the LMC gauge? Or do I have a bad sending unit? I tested three different ones in water from cold to hot and they all read close to the same.

04-20-2024, 09:22 PM	#1
425HP409 425hp409 Join Date: Oct 2008 Location: Prosper Texas Posts: 841	Erroneous Temp Gauge Reading I finished the install of the 396 in my truck and installed a new temp sending unit. I also installed a new LMC temp gauge that has temp readings from 100-250 instead of the original gauge that reads cold and hot. The temp gauge only reads barely off of the 100 line when the engine is at operating temperature. I checked the gauge by opening end shorting the sending unit and the gauge responded correctly. Anyone have this problem with the LMC gauge? Or do I have a bad sending unit? I tested three different ones in water from cold to hot and they all read close to the same. __________________ Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette

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