Can you see through one hole (with light shining through he other)?

If so how far away is the diaphram from those holes?

If you have the room to drill and tap them for plugs, you probably have the room to tap one for a fitting.


If you want to put the reference line elsewhere you can cover those holes with a piece of rubber and run a larger hose clamp around the pump.

My, what a steep learning curve. Erik II#5155