Anyone know Holley Commander 950's? programming?

67Dart273, I agree that Holley's $850 price for the wideband O2 option is outrageous. As you found, the Commander 950 can use the analog output signal from any wideband box. I got a used one for <$100 on ebay, but haven't installed.

Bill USN-1
Re EFI pump inlet, I used the factory 5/16" tube on my Newport. When I tested it, fuel pours from the tube into a bucket just due to gravity (once you fill the "up" siphon), and thru a "carb" type filter, so I saw no way that would restrict the pump, and it doesn't seem to. I have driven it many times in 110 F Sacramento weather and never had a problem. The pump does make a racket if it sucks air (low fuel sloshing in tank) and I don't hear that on hot days, so I doubt it ever vaporizes on the suction side. How much extra length do you think it is from under the rear seat to the engine bay? Pretty insignificant pressure drop. On my Dart, I plumbed a new 3/8" tube and filter from a new 3/8" sender just to be sure. It has a Walbro pump which circulates more volume than my 273 will ever need.

Just because people write things into manuals, doesn't make them true. I wonder if many of Holley's people even have degrees. I knew a person who worked at Boeing designing aircraft wiring and said the most technical person in the department had a forestry degree. One of my jobs was designing and simulating very complicated fuel controls for aircraft engines, so designing a fuel system for my cars doesn't stress me.