Chevrolet gauge with D & C

GMC gauge with +50 to -50

What are the background colors of your gauges? It looks like they are the same/similar colors? Someone else will have to comment on the years (if any) that GMC and Chevrolet had the same background-color gauges (maybe 52-53?).

It looks like one oil pressure is 0-60 (for GMC?) and the other is 0-30 (Chevrolet).

Maybe someone put an 0-60 Chevrolet after-market oil-pressure gauge in that cluster?