Thanks that will help too, I think I found the issue! Rats ... chewed the harness up... (its been sitting for some time)

Hi, I am trying to get an old unit to fire up, apparently it used to "go fine" until the fuel tank rusted out..
Fixed fuel tank and fitted new pump, all lights etc on dash work but no fuel pump, injector pulse or spark. It wouldnt turn over to begin with either so I bypassed this and run a wire to relay from switch. All earths and main power to relay block are fine. Swapped a few relays around but no change. Power getting to ECM.
I suspect the ECM as it seems something is killing the main circuits but I havent got a tool to test it, is there another way ?
Its missing the handbrake assy, do they have a start cut out here somewhere ? I notice a 2 pin plug in that general area under center plate but cant track it down as yet (still trying to follow chinese converted wiring diagram!). Any tips welcome for troubleshooting start point thanks..