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It’s aftermarket.....have to trace the wires to see where they end up. Light maybe?
Of course its an afterthought/aftermarket....but look at the picture above it. Notice the 'OEM' switch. I figured if someone knew what the OEM switch was for, then i would most likely know what the aftermarket toggle is for.
The oem switch there adjusts the position of the pedals forward and backward. I doubt the diy switch has anything to do with that, it's simply a convenient place to put a switch.