There are some cars which are documented to never have all the monitors ready. The 95-99 Eclipse/Talon is one of them. In order for you to pass the check you need to go to Mitsubishi to have the monitors all disabled, drive to the DCC without turning the car off and getting them to scan it. It's a few hundred dollars to get this done each time and MUST be done even if you put all new sensors, ECU and wiring.
I have a highly modified 1995 Eclipse that I need to do an emissions with. Ughh.. Its going to be so annoying.