I wandering what type of mount I should use. I have a homemade fiberglass dash that is quite thin(weight under 5 lb and the windshield is lexan. I think I need some sort of thru the dash mount. Suggestions?

Thankyou

Do I need a functional telephone connection to make the system work? In other words can I just use a phone that doesn't have a telephone # and is dedicated to only laptimer use?