[HWYSTR455]

The 10/12GA wires are for ECU power, correct? Those don't need to run through the firewall with all the others. I have two posts that are under the dash on the driver's side, one that's full-time/batt power, the other is key-on that's triggered through a relay.

One thing to keep in mind is that there are several wires that need to be signal & noise isolated, and the connector needs to be shielded. Using a low-quality connector will produce troubles that are hard to track down. Believe me.

You can split the injector harness from the sensor harness as suggested by using two connectors, which would allow further distance from other wires to provide more isolation.

I'm always interested in ANY source for these bulkhead connectors, so all can post, I'll keep it handy.

The problem with using the harnesses as delivered from most 'kit' EFi people is that the hole needs to be massive to pass the connectors through. You can pull some of the connectors' pins out and pass just the wire, then put it back together, but that can lead to boogered pins, and difficulties pulling it back through. Me, I refuse to cut a hole that big in a classic musclecar. Against my grain!