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Harness through the firewall

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When running the harness through the firewall what connection do ya'll us?

It depends on the number of wires and the budget. Lots of choices from places like milspec wiring:

https://www.milspecwiring.com/MATCHED-KITS_c_671.html

I've had great luck with this company.

https://mavenspeed.com/collections/b2t-engineering/products/dual-connector-bulkhead

For professional/bling go Deutsch AS and ASL.

For club/amateur I use Deutsch HDP20 series for quick disconnects/CPC and for semi permanent installs Deutsch DRB. Nice thing about sticking with Deutsch is pin commonality.