I replaced the windshield in a 07 Tahoe with rain sensor. There was some kind of gell between the glass and the sensor on the original windshield but it did not come on the new windshield. The auto wipers don't work since the replacement so i am assuming it is because of the lack of the gell. I can not find a supplier other than G.M. and you have to buy the whole sensor to get it, list price around $135. Any help would be great.