Whats the best way to wire up a volt gauge?

 

Really easy to do and best to make it come 'on' in the acc position before main ignition.

Quickest way is to tap into the radio feed, three connections to make.

+12v live on in the acc postion.
Lighting feed
Earth

 

That sounds like a good idea.

I wasn't sure if it had to go to something specific.