<<<<<Mark M wrote: At any rate, I think I have found the right unit. It is listed on the Checker site as being for a car with a light (mine has a gauge). But when you click on the detail, it shows the right looking part and says "for a light OR a gauge." That "or a gauge" is really critical info. Don't know why they didn't list it that way righ up front . . . >>>>>>>>>>>>> It should say "for a gauge AND a light". One of the blades on the sender is the variable resistance for your temperature gauge, the other is the switch for the Sentry light to warn of overtemp. The Standard Ignition part number is TS-15, available at any CarQuest. Regards Michael Roger and Michael in San Diego 67 Crown Convertible "Moby" 73 LeBaron Coupe "La Bomba 56 Sedan