Where to install Temp gauge on the Slant

Some gages have multiple lamp wires to allow a color choice, especially newer LED types. I think most ground thru the case, so you just connect 12 V to whichever wire you desire.

You can tap the dash lights wire either in the fuse box or from the headlamp switch. For former, you can buy taps that slide over a round fuse. For later, release the terminal (small flat screwdriver or such) and slide in your own jumper terminal w/ a branch to the factory wire that was there, and don't leave any exposed copper (heat shrink, ...).