I don't know about better gauges, but one time on my air blast sprayer I had a glycerine leak and I just added more glycerine thru the port that has a rubber plug in it on the side of the gauge. That fixed it for 2 or 3 years and I then repeated it. Glycerine is cheap at a drug store.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.