mine came with instructions that were clearly translated directly from japanese and therefore made no sense whatsoever, so here is what i did, from my best memory...
1)remove the two screws in the top of the outer gauge cluster trim and pull the trim out.
2)pull the gauge cluster straight out by pulling on the sides of the clear lens.
3)press in the clips that hold the plastic lens and the black plastic around the gauges in and remove them.
4)do not attempt to remove the needles like others do, just use common sense and slide the gauge over the needle with the needle sliding through the hole in the gauges.
5)use tape on the very outer edges to hold the white gauges on top of the stock ones. the tape will be covered by the plastic later.
6)plus in the included wires into each gauge and run the wires through the holes in the plastic surround and put the surround back on with the wires hanging out. put the clear lens back on.
7)put the gauges back in the dash and run the wires down through the dash.
8)plug the wires into the appropriate relay box for the indiglos
9)mount the ground wire and tap the power wire into the parking lights. then mount the dimmer switch and run it to the relay and your done.
hope it helps

1995 Eclipse GS - HRC Stage 2 - Retired.
2004 350z Enthusiast / 2008 Nissan Versa SL