Looking for a wiring diagram. I have what I believe to be a 90ish mercruiser 5.7 inboard with a velvet drive. It has a 8pin square/flat wiring harness at the motor and back to the helm. Anytime I look for wiring diagrams all I get is the round 9 pin harness so I’m having trouble identifying what I have. Looking for any insight on this style wiring harness.