as the title says i hooked up my air fuel guage in my 2000 2.5 RS.
i hooked it up after the PO 420 CEL fix that is already on the O2 sensor any ideas what i should do now. i disconnected the air fuel guage again but i still have the CEL

If you just disconnected it and haven't driven the car much or at all, don't be concerned. The CEL should go out after driving it a few times. If it's still on after a few days, go back and re-check the wiring.
You also have the option to clear it by disconnecting the battery but I don't recommend this, because it will also clear out the adaptive cells in the ECU and force it to begin the "learning" process all over again. No need to do this if it isn't necessary. You'll also lose your radio settings.

ok ill just wait a few more days then
but could i hook up the guage again and have it work? or is that gonna mess it all up again