I was able to dig through my junk piles and find a PWM controller kit I had gotten a few years ago. Its a simple little circuit kit and it hadn't been made yet. So, I soldered it up last night. Here is a pic of it out of the instruction manual. I don't have actual pics. This little dandy is capable of handling up to 20A, so it should be more than plenty to control the EGR valve. The smaller plastic pot lets me adjust pulse frequency, and the large pot allows me to adjust duty cycle.
