Damned bulkhead connectors.

I got lucky and got a scrap warranty harness from work that melted one plug. The rest of it was good and had some nice Deutsch 24 pin bulkhead style plugs. Ended up rewiring the entire engine bay with stuff I pulled from the scrap harness. Nice solid pins with a twist lock weatherproof connection. Made a sheet metal patch panel to cover the old square hole and put the new bulkhead in that piece.

The individual parts for those bulkhead connectors aren't exactly expensive, it's just when you add up everything you need and realize you have to double it because there are pins on one side and sockets on the other. A pin is maybe only 60 cents, but if you have 24 wires that's 48 connectors, so you're already near $30 for pins alone. Then add the cost of the bulkhead itself at another $20-40 and it adds up quick.