I got a 94 civic ex that im throwing in a 2000 GSR in it. motor came out of a 92 Hatch Cx. Everithing worked fine but three extra wires ran from the Ecu to the main harness then to the back of the block. Now this civic is an Ex so it already brings Vtect so the two Vtec wires on the harness are aleady there so I think. Is it just plug and play or need to still run the two wires? Also theres a wire that goes to the back of the block whats is that for? Its either knock sensor or oil light switch.
Thanx