On a side note where did you get that firewall grommet ?
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Hey Marty! Thanks!
The one in the center of the firewall is from this Dorman kit. It's barely OK, does the job but the ears are small so it's not terribly secure. I'm going to anchor it in the cab with some weather strip adhesive. I also used a couple of these bulkhead fittings (second pic), got them from a local electrical panel shop. Sorta big and not real attractive but without going to a Deutsch connector, these did the job.