I laid out holes so that I could mount the ARINC 429 module on the fold down panel to the forward baggage compartment. Drilled the holes up to #13 and mounted the module. I used AN3 bolts, which are a big overkill. I need to order some #10 screws for the permanent mount. I ran the wiring from the GTN650 to the ARINC and secured with an Adel clamp. Stripped the wires, crimped on pins and inserted into the D25 connector. I also ran a ground wire back to the forrest of tabs. I wrapped the wires with some self fusing tape and assembled the connector hood. Done!