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If anyone was awaiting an update on this, I tried using a lm358p operational amplifier to try to do 12V - the backlighting voltage, but I probably bought cheap parts because the first time it didn't work and the second time it was off by a large factor (12V - 5V was 3V). This is definitely...

Hello! I've been working on installing custom ambient lighting in my car, and one of the first things I did was install a toggleable custom dashboard button (like https://www.ebay.com/itm/204149155743). At first I just linked it to the fuse box and had the 12V run through like normal. I ignored...