Hi Phil,
You don't need any special tools to install the harness on your RZR but you will need some wire crimpers/stipers and a heat gun to attach your add-on circuit to whatever you are connecting it to - example; license plate light.
We do provide you with high quality heat shrink butt connectors that you can use to connect the power and ground from the Power Adapter add-on harness to another circuit. You will need to cut the wires to the proper length and then strip about 3/8" to 1/2" of insulation off the wires so they can be crimped in the HS butt connectors. After you crimp them tightly to both ends of the wires you will then need to heat the insulation on the butt connectors so that they are sealed from any moisture or dirt.