I am putting and 85 EFI into my 83 and have a few ?? I pulled the entire harness from the 83 and I am using the 85 because most of the plugs match up but some don't. The cluster plugs don't so first question is will an 85 cluster mount up to the 83 dash mounts with just a littlel mod? Second is do I need to run a check engine light? Third is what dash light or dummy lights do I need to run that are nessasary for the EFI to run. Forth ? is Do I need the nuetral safety switch? A buddy has an 85 runner with EFI and does not have one. All I am wanting to run is the heater which is good as far as matching plugs. the plugs on the steering column pluged right up but the ignition did not. That is no problem either. Has anyone put an earlier model cluster into the late model dash?