Built an sbec simulator and posted the details in the electrical and fuel guru temple but didn't realize at the time that a lot of people can post comments to that thread so I will add this one for any questions or ideas that might help me out in making this better. Here is a few pics of the unit. So far I have simulated engine rpm, vehicle speed, coolant temp, throttle position, idle speed motor, oxygen sensor, auto shut down relay, ignition coil firing and injectors. I am currently working on the knock sensor signal.