gauge cluster swap wiring

[76stepsidechevy]

I picked up a 77 tach cluster and im looking to install it in my 76 with factory gauges. I did some poking around and it seems like this would be pretty much plug and play for me but I just wanted some reasurance. My truck already had gauges from the factory and the mechanical oil pressure gauge. I know the tach has its own harness but will the pinout be the same ? The only difference I see is the gas gauge and brake light being in different locations.