as far as wiring or getting onto the existing gauges? I just spliced my 2 wires with 2 on the parking lights, I picked 2 wires and they worked so I left it. Now to get the gauges on, you need to take the little screws off the 4 gauges. Put the needles at 12 o'clock and slide them over. It takes a little wiggling, but it will fit, then tighten the screws back