Carl,
I don't recall where the "standard" location is, but I ended up putting mine through the doubler on the bottom center of the firewall. If I had it to do over, I would wait until I had all the "other" stuff mounted and then sort out the best place to put the hole.
greg
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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