Running without EGR will cause the check engine light to come on after about 30 minutes of highway driving. It'll will run just fine without the EGR. You'll have to reset the ECU to kill the light. Once it comes on, it won't go off.
On my 94 hardbody, I would just floor it when the light came on and the light would clear. OBDI, those were the days
I've got JWT Turbo ECU with the EGR resistor. I could pull the cover and get you the colors off the resistor. Somebody here should have the info ***.