1. Have to lookup that one. I don't think I used a PWM channel for the tacho.
2. Yes, you will see 5 volt here. Needed for the map-sensor and the throttle position sensor.
3. As fas as I remember this is switched to ground not 12 volt.
4. What kind of coil pack do you have? Ford wasted spark?
5. Comms should work with 3 wires. In the worst case you have to switch pin 2 and 3 in the connector.