Originally Posted by theboysmiffy
In the short term I have gone for the Bravo inline gauge until I find an original Zodiac unit. Hopefully this will allow me to get reasonably accurate reading, its got to be more accurate than guessing.
If reading your gauge attached to pump is not that accurate while pumping downward, remove the gauge from upper pump, drill a hole on spare valve cap that matches intake valve thread diameter, screw cap on valve, down screw the gauge untill you have a good reading, cracy glue the thread on that position on both sides of cap.
One problem you might encounter, the valve pin is much thinner than gauge hole entrance, so there will be no pin valve activation, if remember correctly, the original gauge adapter has a cone type entrance that slight pushes the valve pin when pushed.
Have removed my Bravo 10 gauge and made a Halkey Roberts valve adapter with flexible car hose, this valve has a thick central spring pin easy to push, now have a simple & precise easy to read inside & outside sib gauge. Seal the hole If removing gauge from pump.