[stackj]

Herb,

Before you drill any holes in the new windshield, make sure you are using the special 4 flute bit. When I replaced my windshield 15 years ago, LP Aeroplastics made sure I knew I needed the special bit to drill for the thermometer.

I think the issue is that the regular 3 flute bits (which also have a different cutting edge angle) can cause the windshield to crack around the edge of the hole you are drilling.