I'm installing my boost controller/boost/afr/oil pressure gauges which all require a 12V source.



I'm going to use this to spot to tap into. Is it possible to put all 4 devices onto the same tap? Or I be searching for 3 other spots to tap into? If it is possible to use one tap what size fuse should I use for the inline fuse?

 

Sodder or use a butt connector to put all wires into 1 wire. Then you have one wire. Btw, you don't want to hit the constant. You want the accessory power source.

 

use the switched one. and use it as the "trigger" or signal for a relay that will turn those things on. then run a power wire from the batt into the cabin to the relay