Hi All, I did this today. Factory grommet behind the panel with the jack in it. Took the grommet out and feed wire through the hole and pulled through. Then ran along fuel/Brake lines back and up into engine bay. Quick and easy no need to move all the kick panels and run through the cab. Punched a neat hole through the grommet to seal for dust and then wired a double 12v narva sockets and voltmeter.
Secco, I think you've saved me about a days work. Cheers.