We decided to hire the basic installation and wiring of our instrument panel to a professional. So, John Starke in Georgia installed the avionics and switches in the panel we had cut to fit. We also bought through him most of the three GRT HX EFIS units, the GRT engine monitor, a Garmin. 430W Nav/Com, a Garmin 330 transponder, a Vertical Power VP-200 solid-state electrical control system, a Garmin Com, a Trio Pro Pilot autopilot, a second non-WAAS GRT GPS unit.