I just purchased another hds unit for the front of my boat.I have an 8 on the consle and I'm adding a 7 up front. My TM is a Motorguide Tour edition. I read somewhere that the TM will need a ground wire. I only plan on running a 2d ducer on the TM. Could someone explain this to me?Wwhere, what and how and any picks would be helpful.

Also, how many of you guys solder your wiring connections. Is this a good or bad idea?


Thanks In advance.