If your engine is DDEC, the best option (and most fun!!) is an electronic dash from Silverleaf (http://www.simply-smarter.com
). I use the VMSpc which is free software for a laptop I place on my passenger side dash. You need to buy their "magic box" for about 4$400. You can also use a DD Pro Driver or use a Pro-Link. All of these connect to the data port in the driver area.
If you have a mechanical engine (pre-DDEC), you are stuck with running wires to the sensors.