Are my gauges / wiring correct for my 1977?

[3x2GTO]

I'm trying to get my gauges working on my 1977 K10,and I need help on ordering the right gauge printed circuit. Sometime in it's past, my truck has had a 2wd cab installed, and I'm wondering if my gauges and wiring are the original 1977 ones or maybe 1978 on up. The printed circuit is torn/rough shape, and has #25017325 on it, but that comes back to a1978 truck? My oil pressure gauge is not working, also half the dash lights are out, everything else, except the 4WD indicator light works, the wiring harness is in great condition. My truck has glass fuses, electric oil pressure gauge, 4WD indicator light in the dash and the 1975-77 style wiper motor, everything looks like it's been there since day one. Also, where is the 4wd indicator switch located on a NP205? I'll post a gauge picture tonight. Thanks!