can i swap parts from a 99 sonoma to an 85 S10

I have the ECU, Main Wiring Harness, all of it, the intake manifold, Coils, and
the fuse box under the hood (and any other part needed to get this 85 S10  
running. ECU went out on it and all i have is the sonoma to use as parts. ive
got my brain wrapped around it on most everything but the guages and a few
other pig tail plug is as the 85 is a four speed and the 99 is a five speed. i
need big boy answers if thats alright with everyone. i got this one close to the
chest and a couple good tips could tip the scale in my favor. so please show
out cause i think if i get it all hooked up, it will be something worth... talking
about. if you know what youre talking about please feel free to show out!