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If you just want to test if they are working, just hook them up to 12 volts, if the needle moves the gauge works, not sure on how to test accuracy though.
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14 Dodge 3500 Mega Cab
08 Dodge 3500 Mega Cab
87 Chev 3+3 4x4
80 GMC K10 High Sierra bone stock
70 Chevelle 350SS long term project
68 GMC 3ton Grain Truck/Garbage wagon
50 Pontiac 2 Door Coupe Project
"I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.
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