very simple just take apart your dash (search for the how-to as it has been written to ad-nauseum and use some sort of very thin double sided tape or adhesive spray to adhere the gauges. You should not need to remove the needles to put these on. wire them up (self explanatory when u see them. They just click together to the inverter). The hardest part is taping into the right color wires for power and neg on the light switch so they turn on w/ the lights. To be honest I forget what colors. Someone else might chime in.
