your first post you just replaced the harness. now it looks like you fixed the wires for the temp sw, starter, alt and oil pressure sw. at the firewall. hope the rest of thee harness is in good shape.

as far as the ecu temp sw goes, it belongs in the head. i you have only 1 sw in the head, the ecu temp sw is not there. it is always in the head and always below the intake, usually between the front of the head and the temp sw. look next to 3 and 4. see any plugs in the head? should be at least 1 with a hex head. the left over connector, does it look like the injector connectors? if the left over is smaller and different than the injector connectors, has a blue/yellow wire and a brown wire, that is not the ecu temp sw connector. it's a hold over from the kjet cars that all lh harnesses have. you have nothing to hook it to. after this, i got nothing. good luck, chuck.