I'm doing a frameoff on my 90 chev silverado, and the previous owner had cut the wiring harness off at the bulk connector on the drivers side firewall and and Passenger side. I am pullin the current motor and 4 speed combo and putting in a fresh 350 and 5 speed from my donor truck of the same year. I have a wiring harness from an 88 chev but it had an automatic tranny, so basically my question is can i plug my 5speed computer into the automatic's wiring harness and have everything work properly?