Questions regarding swapping dash instruments

[LRedL6]

Hey everyone,
I'm looking to swap the factory dashboard my truck came with (fuel gauge, speedometer, and a couple of dummy lights) over to a dash that has instruments for oil pressure, engine temp, voltage, etc (no tach though). I have roughly three dashes from donor trucks and just lack the know how/required lines and wires. How complicated is this swap? Will i need different sensors for my engine or will I have to change my wiring harness? Any information at all would be greatly appreciated.
Thanks