Electrical tape glue gets messy when it gets hot. Even 3M's Super 33+ (the best electrical tape made, IMSNHO) will get gooey inside of a car.
My high-beam indicator was blinding me so I took a small piece of static cling film (the stuff that you have to peel off new electronics), marked it up with a black marker, and placed it on the bezel. Can be removed or repositioned without leaving any residue.
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