Anyone know Holley Commander 950's? programming?

You can't program with a narrow band. The problem is you have to get it right for the narrow band sensor to be right. If the mix gets very far off, the sensor goes stupid. Wideband O2's aren't easy to come by cheap. They're very in demand. I paid about $170 on Fleabay. It depends on if you want a gauge with it or not.

FWIW, make sure that your system doesn't JUST need the sensor. The sensor by itself is not too expensive. What I had to buy was the sensor and it's interpretive hardware (that included a guage). I'm not familiar with the Commander system. It may or may not have what you need to read the sensor. If not, you gotta buy the guage.