Well, looking thru this forum convinced me to buy the Z1. Installing in a 07 Tahoe. However, not being very good at electronics, decided to have it installed by a shop. I am having second thought about the shop. First, they can't locate the onstar/bose interface to install. have to wait a couple days to get it. Brought the car home and noticed that there was a couple wires still in the box. extension lead (for reverse signal) and extension lead (for speed signal). Also, the connector. Aren't they supposed to install these? Any input will be appreciated.
TIA
