FlyWithTwo wrote:
Hi Todd,

Since you already have an intercom and audio panel, you don't have to
tear out the interior to run wires to mic/phone jacks, provided you
already have them at all stations. The wiring that goes to the new
audio/intercom is already behind the panel, and just needs to be
terminated on the new connector.

I disagree.
The wiring is no doubt incredibly old and the insulation, probably
close to crumbling. What's the point of doing an upgrade of the electronics
if the same 'transport medium' is used? Pull out the interior, and while
you're at it, you have the opportunity to check the insulation against
the airframe, make sure there's no corrosion, etc. As the owner, the
interior comes under the category of owner-permitted maintenance. And,
with the avionics A&P's supervision, you can also run new wiring
at the same time. Take the time to do it right.

I do agree wholeheartedly about the PSEngineering intercom. I
put one in (rather, the avionics shop did) a few years ago and am
very happy both with the unit and support from the company -- a number
of the PSEng. people frequent this newsgroup, BTW.