As part of my cab project I decided to give remote start a go. I'm using 2 wireless relay boxes from china, about $8 each, plus a 30a relay for the glow plugs. One relay bypasses the key switch to ON, the other is a 2 relay system which bypasses the starter and activates the starter solenoid and activates the glow plugs.
Here's a video:
https://www.youtube.com/watch?v=UekigiTT79A
Here's a video:
https://www.youtube.com/watch?v=UekigiTT79A