easy stuff..get a 12v tester (like $3 at radio shack)
Use it to test the wires on the switch you use to turn on the headlights.. find out which wire gets 12v when the parking light is turned on... then tap the positive wire of the gauges to that wire...
look under the dashboard and see if you can find a screw that is screwed into bare metal.. you will connect the ground wire(black) of the gauges to this screw... Just unscrew it, wrap the wire around underneath the head of the screw, and tighten it again.. make sure that the wire is touching bare metal.. Turn on your headlights, and watch your gauges glow!