gauge setup question for yall?

[Tex_50613]

I have a gauge cluster out of a '74 C-65 that I plan on using in my 85 K-30 that I'm installing a 7.3L diesel in to render stock manual gauges (oil and air pressure specifically), also to give me a tach. and back date the truck to go along with the '73 front clip, the question I have is what additional wiring or re-wire do I have to do to the 85's interior harness to use the 70's stock cluster with tach with the fuel gauge in it (if they work) also a good place to have that gauge repaired if it doesn't, also did Chevy ever run a volt meter instead of a amp meter? 95% of the Chevy's I've had up to this point have all had Idiot lights or aftermarket gauges.
here's the cluster I plan on using, I also have a spare light truck cluster if I have to replace any of the other gauges that may mot work after I get it all hooked up