You could probably put a good used box in for a lot less, though
perhaps not linked to the A/P. 6K range for a used King/Apollo unit +
install/certification is the estimate I've seen from multiple sources
for a 172.

Yep. It's that install/linking/cert that runs the price up. Other than a
430/530 box the labor may well equal the price of the unit.

Howard


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