The Chevrolet lenses are: a left and right green for turn signals, red for high beam, those are the only colored lenses on the '55 - '59 Chevy cluster, I have no experience with the GMC. Can you trace the wires and find out what might energize them?
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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