Very interesting project branch Bert... I think this could be very helpful it finding the set on those hard to tune conversions. I have noted a few times that these conversions have a wide band of acceptable "running" adjustments that will only show secondary issues in the form of dirty exhaust or running changes with Ambient and engine temps excursions to high our low. The ability to tune and observe actual mixture conditions is a very good capability.

On the item of the sample not being actually pumped - do you think one of the little air pumps I use for tank pressurization might be of use?