So we mentioned that some of the plastic plugs from the old harness have to be reused. The very detailed instructions that come with the harness tell you when you need to reuse a connector. The Painless Performance harness has crimp-connectors in place when a factory plug has to be reused. If you are like us, you can alternatively solder these joints and cover the joints with heat shrink. Here is one of the plastic connectors that must be reused if you want to retain the factory YJ dash-lights. Other parts just clip together with a snap in the factory location using new plastic plugs.