Ok, starting a new thread as the frame issue is pretty well determined. As to my "big truck" gauges, I see in my 1964 owners guide that Chevy had two types; a simpler one for 1/2- 1 tons using tell-tale lights for temp, generator, oil pressure, brights and turn signals and a meter for fuel level and speedo. The other is for 1 1/2 - 2 1/2 tons with individual meters for temp, ammeter, oil pressure, and fuel level and speedo, and tell tales for turn signals, brights, tandem lock-out and overspeed plus an option for an air pressure and a tach meters. Now I've seen the latter in other C10's as well as mine mine so was this an factory option or simply a swap-out?

Brian