Connected comm, intercom, and transponder power and ground lines. Connected co-pilots push to talk button. Now ready to test radios. Connected EFIS altitude output to Transponder. Connected DC power plug. Routed wires to autopilot control head. Connected EFIS and GPS power and gournds. Connected GPS serial output lines to autopilot and EFIS. Connected ELT lines to control head. Still have EMS and autopilot head wiring to do! Reviewed magneto sparkplug wire routing. Connected Manifold Pressure port to engine.