This kit overall was great. My taillights were barely working, even after a new turnsignal switch and new bulbs. I ordered this kit, within an hour I had taillights as good as new. I installed the parking and side markers later. On my 70 Cougar the side markers use a module adapter with a ground. Only issue I encountered was that the modules do not like to stay plugged in to the original marker light plugs. I solved that issue by using small and medium zip ties, one holds the module and plug together, the second around the module keeps the first from sliding off (the module is round). The back markers I grounded to the taillight studs, the front to the valance support. The front markerswill be easier to install on a lift if you have access to one, but can be done in the garage. After complete install I now have hazard flashers also. If you are doing the install all at once allow three to four hours to complete it.