The gauge is at the top of the line. From the last tap to the tank is only 5 ft of drop and the top tap to the tank is maybe 10 feet.
Printable View
I have a run of 3/16 that doesn't have a whole lot of slope, maybe 1/8 inch per foot for 200' and then drops 10-12' after the last tap. The only time I have checked it & it wasn't running it was well below freezing, it has never stopped otherwise. Very happy with it so far. Going to put the Vac gauge on it tomorrow to see what I am actually getting. It has 17 taps on it
You may actually have more drop than you think, or possibly faulty gauges.
sugarsand