Factory Temp Gauge quit working. Where should I start?

[72skytop]

I am working on a basically stock 1971 Chevrolet Cheyenne Super 10 with a big block 402. It has dual temp sensors with one in each head. The gauge has work fine up until this point and I haven't worked on anything recently to have given it reason to quit...I looked in the 1971 Service manual but that book is kinda different than later model GM service manuals in that there is really no trouble shooting procedures to find the problem on anything...just disassembly and reassembly instructions....But anyway... the only reason I am starting here is because I drove the truck no less than three years without an amp gauge working only to find out that all it was, was one of the little fuses was blown that are located on each side of the radiator and that was all it took to fix it. I just wanted to check with you to see if there is a simple, almost always that's what it is, fix before I start tearing into it.

Thanks in advance for taking the time to type in all your suggestions.

Chevrolet truckingly yours,

Kevin Korff