Last job is to balance the carbs, and I can't seem to get it right

[BBROWN1664]

these setups are not that good at giving correct pressure readings but they can be good for making sure they all have the same negative pressure.

That's my point exactly DP.

Daviee - You may have spent some time professionally or otherwise playing with vacuum gauges but as a qualified aircraft avionics engineer I do know a bit about suck and blow instruments and how they work as well as how they should be calibrated.

for information, the ones with the stop pin need adjusting to be a fraction off the pin when you use them to take the ambient atmospheric pressure into account. When the ambient pressure is lower, the needle will try to move below zero if the last time you used it, the ambient pressure was higher. Just so you know the reason :pokefun