How To: Fit aftermarket Reverse Sensors

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Also looking at this walk through guide, why do you tap into the reverse light positive wire in the boot lid by the bulb.
Wouldn't it be easier to tap into the same wire by the boot fuse box. That way you wouldn't have to feed the wire from the reverse light through the flexi hose all the wires go through to the boot lid. I know there will be more wires to go through to find the reverse wire but with a multimeter you should find it.