1965 gmc dash info needed!!

[kvchevyboy21]

hey gang, I just purchased a 65 GMC, and I've been going through the truck the last few days just getting a feel for what all it needs and what's missing, which is a lot of stuff. my biggest head scratcher is the instrument panel, out of everything on this dash the only gauge that works is the oil pressure gauge, the only knob that works is the head switch, as for the rest I have no clue what they are because none of them work. as for the guages i am guessing i have messed up wiring, actually it has to be because the whole dash is just a wiring nightmare. if any one has any information at all to help me get this back in working order I would really appreciate it!!!