Easy 12V power source for gauges?
 

So here's an newbie question; I have an AEM Digital Wideband that I need to tap into a 12V power source. Is there anything close to the driver's A-Pillar I can wire it to for power? I also have to wire power to my boost gauge for the light, which wires from the dimmer switch could I tap into for dimmable lights?

Also, any tips on big thru-hulls on the firewall would be very appreciated

You can get switched or constant power via the fuse box near the dead pedal. There's two unused slots above the fuses, and either both supply switched power or only one of them does while the other is constant. I can't remember for sure so you'd need to look it up. Alternatively, you can buy fuse taps that plug into the fuse box in place of a fuse. You then plug the original fuse and a matching one into the tap and crimp a wire to your gauge onto the wire coming off of the tap. I wired the light for my boost gauge this way and used the "Meter" (gauge cluster) fuse since it's a switched circuit. I should clarify that by "switched," I mean that something wired into it will receive power as soon as you turn the key to "On." The most common circuit that owners tap into for dimmable lighting is the ashtray light.

https://cimg3.ibsrv.net/gimg/www.rx7...8bf58fd23d.jpg

Thanks for the tips! I didn't even think of using the fuse panel but it makes sense to tap power from there.

Post #3 for switched power with the ignition ---> https://www.rx7club.com/3rd-generati...ights-1126108/

If you (carefully) lift the shifter panel there is an easily accessible wire going to the ashtray light. You can use that as the power source for your gauge light (if any). It will come on only at night and dim with the rest of the dash lighting.

Looking through that write-up, I think I can pull my power for the AFR gauge from the back of the gauge fuse as well, which will help a lot.