you can run the autometer guages, but you will still need to take apart the factory cluster and some where mount the internal cuircitry for the check engine and the tripometer button, these are used in the ODB II system and need to be maintained inorder for the vehicle to be compliant.
Depending on your state, you may be able to re-flash the ECM to no longer run a OBD II system, but I honestly don't know. This is an issue I am having with my state, I want to swap my gas engine in my pick up for a cummins diesel; the issue I am having is that regardless of the motor, I need to have a OBD II compliant system operating correctly (ie no check engine light) and the system needs to monitor the motor inorder to stay off, simply not hooking stuff up will yield a check engine light.