No taps at all. All the sensor connections use factory-style connectors, one male, one female, allowing the box to sit in-line with the factory harness. The only "taps" are the two power lines (red and orange), and these tap two fuses in the PDC. They aren't like other fuse taps that ruin the fuse sockets - they're very thin brass that surrounds the leg of the fuse, and never even enters the socket. The result is you get the connections, but don't pierce any wires, or ruin any sockets.
In short, you have two wiring harnesses that come with the box. One has connections for the three fuel injector connections, and the MAP sensor. The other has connections for the crank and cam sensors. There's the two power wires discussed above, a ground wire, the connector for the remote, and in the case of the remote with gauges, a yellow/red pair of wires that connect to the thermocouple.
The hardest part of installing the box is drilling/tapping for the thermocouple (no different than any other EGT gauge). Second in difficulty is the cam sensor, because of it's location. The instructions tell you to have the wheels turned all the way to the right before starting. If you do this, it's not too terribly difficult to reach from underneath.
Get yourself a tube of silicone di-electric grease, and fill the connectors with this before assembling. Use plenty of tie-wraps to keep any of the connectors from vibrating, and you'll be all set.
-Tom