I sure hope that they are just overlays, because those are the simplest.
Basically, the whole gauge pod comes out, then take out all the screws around the edges, and PAY ATTENTION to where your needles are!!!!! Esp fuel.
If they are overlays, DO NOT remove your needles, just slide the new gauges over the needles and rest it on top of the old gauges. If they are EL GLO or w/e like mine, then you'll have to find which wire is your parking lights wire, and splice it in there. Find a ground, and you're done.
Mine was brown, no guarantee on yours though.