1) remove white plastic cover on ECU connector 2) fold blue ECU connector plastic along harness and wrap entire connector with electrical tape... not a huge ball of tape but ensure it's tucking into the harness and pointing straight 3) (optional) Depin the smaller harness and tape wires down to harness. Alternately, tape connector tightly along harness. 4) Silicone spray the harness with wrapped connectors 5) (get a partner) One in engine bay pulling, one in PS footwell pushing. The 'pusher' needs a good light looking up and will have to twist the wrapped connector assembly to feed out the firewall hole