After Gary from Action Ultralights confirmed the comm radio was ok, I endeavoured to get it installed.  Today I brought the rats nest of wiring down to the folks at Queale Electronics in Victoria, and they got me what I needed to get started.  Also, I brought along the transponder wire that needed a BNC end crimped on it.

They couldn’t do the crimp job, but sent me along to some friendly folks at RadioWorks who took care of me straight away!  I’ll get the transponder hooked up first thing, then dive in on the wiring for the com radio.