geekgranny said:Here is one, of many, gauges. I don't know which to choose but I assume that I would want a liquid filled. Will gladly accept recommendations.
http://www.drillspot.com/products/108044/Ashcroft_63_3005PHL_60_Pressure_Gauge
Big question. The gauges have a connection size of "1/4" NPT" and is what looks like brass. The drain plug on the pump basket is 1/4". In the past I've frequently encountered problems linking plastic screw fittings to brass as the screw spacings are different, like on hoses and dripper system attachments. Will the 1/4" NPT for sure fit in the screw hole in the pump basket or will I need an adapter?
Thanks, gg=alice
Just want to let you know that that is NOT a vacuum gauge - its a normal pressure gauge. You want a gauge that measures in inches of mercury (in. Hg) and if its in the budget, a liquid filled one (you will regret buying a non-liquid filled vacuum gauge - they are almost impossible to read because the needle jumps around so much). 1/4" NPT is standard in virtually all pool equipment when it comes to gauges and stuff like that. The normal vacuum for a pump is about 7 in. Hg so I wouldn't go out and buy one that goes from 0-100 or something like that. Get a low range one.
This one looks good but the connection is in the back so I don't know if it will work for your particular pump.
http://www.drillspot.com/products/87602 ... cuum_Gauge
Edit: the plastic screw things are not working for you because they most likely not NPT (which stands for national pipe thread) which has a different thread type than normal 1/4 inch screws.