transponder

I want to share a picture of how we mounted a toll road transponder in our Model 3. This is particularly useful if you have any film on your front windshield or you simply don't like look of a (typically) white transponder stuck to your front windshield. My wife took some dark paper then cut &...

1.) I've seen on youtube (5:50 into ) that you can have a significant gap on the hood, but is this (see pic) too much? 2.) Has anyone successfully installed a bridge transponder behind the nose cone as suggested on page 160 of the Owners Manual? I'd prefer to do this instead of installing on...

So I just got my Model X. What do I do with my 407 ETR transponder? I'm assuming there is a sensor or camera behind the rearview mirror. Am I wrong? Any suggestions where I should mount my transponder? What do you do?