use a box cutter knife and lots of glass cleaner while u are cutting the stock sticker/glue

dont scrape after, just rub with ur thumb and it all comes off

use jus a dab of silicone, spread it with ur thumb, (clean ur thumb, lol) then press it on with a partner to watch the bubbles, and tape it to the windsheild,
wait 5 hours and reconect the sensor to the plastic peice again and voila!