I have the same car, and I am looking at the factory service manual. Take your dash lights dimmer and pop it out or just reach up from under the dash and unplug it, looking at the wires (there are 3) you'll have a red/black (red with a black stripe) this is the positive 12v wire, hook this to your power wire of the el gauges. Then take the black wire and hook that to the ground wire of the el gauges. the third wire is the variable ground that dimmes the lights DO NOT USE THIS WIRE it is red. Turn on the parking lights and it should work, if not it's time to troubleshoot your grounds and voltage check the power wire, if all is good then the unit may be bad. also make sure if your el gauges have a built in dimmer that you try and turn it up.

the fuse connection (if it's the type that you push in with the fuse) is not the best connection, try the above steps with some piggy back connectors and if it works you can solder them for a better connection (if you can get the iron up in there.

good luck.