91 Dash To A 92 Dash

[HarlanC]

Alright I already know these will switch size wise. I own a 91 sierra. Im not a big fan of my dash cluster. Was at the scrap yard the other day and saw a dash cluster from a 92 that I liked. Only thing Im wondering about is hooking up the extra gauges. Im not sure all of the extras the 92 has but the main one I want is the Tach. Is this going to be a plug and play switch or will I have a handful of wiring to do?