I'm rewiring my gauges and I'm wondering if anyone knows where at 12v constant is that I could tap into? I know that there are various 12v switched around but I need a 12v constant for some of the memory features of my gauges. I've been searching but I couldn't find anything about possible constants to tap into in the interior fuse box or maybe a constant from the stereo. Any help?

 

You can tap into one of the ignition switch wires. Make sure to fuse the line.

 

yeah I thought of that but im not sure on using the ignition wires as the source. a couple of people advised against it.

 

B101 position 1A Blue/Red is a 12v constant to the ECU. 10 amp fused. Careful with this one. Ignition wire is the easiest. I believe the horn relay also has a constant.

 

This is exactly why I always add an aftermarket fuse block to the car. Adding electronics becomes a breeze. Just pop a fuse in the circuit you want to use of the right aperage, run the power source off the fuse block, and ground the electronic piece your adding and your done.