fitting non merc rear parking sensors
got wires to control box near fuses in boot and can see other cables going behind rear seat
how can get to dash preferably under centre dash grill to put display
thanks

 

Hard way: Run wires between carpeting and the tranny tunnel. This is difficult because the carpet is tightly fitted and you may have to remove the rear seat bottom and loosen the front seat mounts to create slack.

Easy way: Most are running wires for radar detectors (dash to rear fuses) via the lower door sills on one side or the other... use the edge of a credit card push the wiring up, between the rubberish door sills and the carpet. Yes it takes more wire, but less dexterity.