I got one of the electric AI's installed, an RC Allen model, for $1800 total (includes the avionics shop's charges). I like it very much and it's comforting to have the backup.
My A/C runs OK on either pump, so failure of one is mostly a matter of noticing it before the other might happen to go, too.
Mine are also wet pumps, which last and last and last. I'm thinking that yours are dry, Bob - in the later models? (Mine is a '67 turbo).
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