Very interesting how all the "experts" who have no idea of the differences in a Chevy and GMC are chiming in.
GMCs did have higher oil pressure gauges, 60 vs. 30 psi. GMC amp gauges show 50 amps, Chevies show "D" and "C". GMC temp gauges show to 220, Chevies show to 212.
I don't know what years of GMC used the cream colored gauges.