Another magnum swap thread

As far as gauges, I'm wanting to run Autometer manual gauges. I'm hoping I can T the oil and temp gauges, and run a factory sender to send the ECM what it needs to see, and have the manual gauge so I can see what's going on. If that will work, I will just remove the wires coming from the ECM to the factory cluster. That's really the only part of this whole deal that I worry about. I do want to wire in a check engine light, and have the OBD2 connection inside the truck to pull codes if needed.