High level overview, still have to do some planning and studying.
I'll be working on mine over the next week or so, but I would say start studying the ecm wiring diagram. Most of the sensor inputs you will be able to tap the engine harness going into the ecm or the connector with the map wires, all under the passenger dash.
MAP, RPM, TPS.
I plan to wire up a dedicated map sensor though, which can be done through the ISAC.
The power supply for the ISAC, I will go right to the fuse box for.
Wideband ground and input is self explanatory.
The boost solenoid gets constant 12v from the engine harness already, you can run a new ground from the solenoid, or cut the factory harness at the ecm and splice that into the ISAC.
Pump will receive fused power from the fuse box and pump ground to the ISAC.
ISAC main ground and sensor ground to engine block.
I think that covers the basics, I don't think (but not sure yet) that any thing else is required to get it up and running. The other features for level, flow, pressure, CO2 control, staging, gear switch, 2nd pump .... are all extras. I don't think any of these are required, just extras if you vehicle is equipped.