Chevy vs GMC
Differences between 1940 - 1946 Chevrolet Truck and GMC Clusters
Chevrolet Truck
GMC Truck
Speedometer - Chevrolet has a 1/2" female connector/shaft and is calibrated to display 0 - 100 MPH, while the GMC has a 3/4" male connector/shaft and is calibrated to display 0 - 80 MPH. In addition, the Chevrolet needle is white, the GMC is red and the Chevrolet face color is brown, while the GMC face is cream color.
Chevrolet
GMC
Though many of the parts are the same and they visually look very similar, there are differences. I will highlight some of the primary similarities and differences here:
What's the same?
The cluster enclosure, face and bezel are the same sheet metal. The gas and amp gauges mechanically and electronically are the same.
What's different?
Cluster Glass
Glass lettering - Chevrolet has 0-100 MPH on the glass, while the GMC cluster has 0-80 MPH ... and the labels for each gauge (Gas, Amp, Oil and Temp) are different, but in the same position on the cluster.
Gauges - All Chevrolet gauges have brown color faces with white needles, while the GMC gauges have cream color faces with red needles.
Temperature Gauge - The Chevrolet temperature gauge is mechanical, while the GMC temperature gauge is electronic.
Oil Pressure Gauge - The Chevrolet oil pressure gauge has a female threaded connector and is calibrated to display 0-30 PSI, while the GMC oil pressure gauge has a male threaded connector and is calibrated to display 0-80 PSI.
