I would really like to replace the boreing instrument panel in my "95 88 with one from a LSS model to gain the tach and full set of gauges. Aside from changing the sending units on the engine to match the "gauge package", is this swap a plug and play? Will the volt meter and tach have to be wired in or is the wiring already in the harness? Fuel sender unit the same? My other option is to fab up a gauge pod and add the tach, voltmeter and oil pressure gauge.

I believe they might already be wired for it. If you can get a Instrument Cluster from a 95 LSS with the same motor as your car (LSS came NA and Supercharged) it should be a plug and play operation. I think the signals all come from the PCM.