Hi
I think you could use any gauge cluster you want.
i would just hook up the wiring like it was the gasser,the hot wire for the coil would go to the shutoff solinoid on the pump.
The only extra wiring you will have to do is the glowplug circuit,and the cold advance for the injection pump.
Thats my plan
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews