any way to test gauges? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**MJN** · 01-16-2008, 04:08 PM

Is there any way to test a temp gauge without a truck to plug it into? I hate to buy a new gauge if the original is still good. The only reason I question it is that the needle, with no power to the dash, rests on H and not C.

**VetteVet** · 01-16-2008, 05:00 PM

You can do a static test if you can access the back of the gauge. You should read between 40 and 50 ohms between the two posts that have the resister connecting them. The resister is the white strip between the two posts.
I applied 12 volts to the two posts on a spare gauge I have and the needle went from above hot to below cold. I don't have a picture to show the posts on the back of the gauge but if I find one I will post it. HTH

**VetteVet** · 01-16-2008, 05:47 PM

I found this and it should help.
http://www.madelectrical.com/worksho...mp-gauge.shtml

**MJN** · 01-17-2008, 02:42 PM

thanks, I'll give it a try this weekend and see what happens.

01-16-2008, 04:08 PM	#1
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,052	any way to test gauges? Is there any way to test a temp gauge without a truck to plug it into? I hate to buy a new gauge if the original is still good. The only reason I question it is that the needle, with no power to the dash, rests on H and not C. __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com

01-16-2008, 05:00 PM	#2
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: any way to test gauges? You can do a static test if you can access the back of the gauge. You should read between 40 and 50 ohms between the two posts that have the resister connecting them. The resister is the white strip between the two posts. I applied 12 volts to the two posts on a spare gauge I have and the needle went from above hot to below cold. I don't have a picture to show the posts on the back of the gauge but if I find one I will post it. HTH __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-16-2008, 05:47 PM	#3
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: any way to test gauges? I found this and it should help. http://www.madelectrical.com/worksho...mp-gauge.shtml __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-17-2008, 02:42 PM	#4
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,052	Re: any way to test gauges? thanks, I'll give it a try this weekend and see what happens. __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com



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