I'm installing a mech boost gauge, and was loking for a write-up....can't find anything! I need to know where to get through my firewall....i know the spot w/ the rubber nipple up inside the glovebox...and there's also the ecu cables running through the fender...what other spots are out there?

Also...What's the best place to tap for lights....i wanna tap the wire onto my elec. line for the lights, so when i turn on my lights the gauge lights up....

Thanks guys