Two questions if anyone knows - pump / pressure gauges related

[JDGriz]

First question: I have two pumps and a compressor and several air tanks with gauges, and all gauges show different numbers from one another. It is impossible to know what the actual pressure is.
Does anyone know if pump/compressor hoses exist, that allow a 1/8 BSP thread pressure gauge to be installed on the hose itself somewhere? Or maybe an adaptor that sits between the hose and the pump, or between the hose and the air tank?
I have an electronic pressure gauge that I could install somewhere, and which I think might be most believable, but the most obvious place would be on the hose itself somewhere, which would make it reusable.

Second question: see this pump image -

Notice, how there is a red colored piece at the end of the hose. This is a filter for oil/water. Should the hose be installed with the filter towards the air tank, as it is on this picture? Shouldn't this end be connected to the pump? What about the bigger size pump filters, like this one:

Should this filter also be connected on the air tank side (to the quick attach probe)?

 

[Shaky2]

Not sure if its what you want but Air Venturi has a gauge that you can put in line between pump and gun or pump and tank. It had foster fittings on both ends

 

[JDGriz]

Not sure if its what you want but Air Venturi has a gauge that you can put in line between pump and gun or pump and tank. It had foster fittings on both ends

Yes, found it:

Air Venturi Inline Air Pressure Gauge, Gen 2 | Pyramyd AIR

We've got a great price on Air Venturi Inline Air Pressure Gauge, Gen 2 at Pyramyd AIR. Shop where the experts do!

www.pyramydair.com

I suppose a T-junction adapter piece would be best, if it exists - I can install the foster fittings myself, and the gauge.

 

[JDGriz]

..Now that I know that it is called an "inline pressure gauge" I've found the old threads, like this one:

Inline fill/pressure gauge for tank use?

Hi Folks! I'm new enough, that I don't know the proper name for an item, but I'd call it an "inline pressure/fill gauge" for air tank to gun use... with foster fittings on each end.... like this..... Here's the gist.... I purchased a second hand, 30 cu ft air tank, which has the gauge...

www.airgunnation.com

and this:

So What’s The Real Pressure In My PCP? - Hard Air Magazine

Often there are differences in readings between the pressure gauge on our PCP and fill tank. Hmmm! So what’s the real pressure in my PCP?

hardairmagazine.com

 

[Trucker3573]

It really doesn’t matter which end (pump or gun) the inline filter is closest to.

 

[Airgun561]

Set the hand pump up like this..works great!

 

[Bam86]

Unless you have the gauges tested against a standard, you really can’t trust any of them to be correct. Kind of like the old joke about a man with two clocks….

Even the digital could be off. Just because it gives a nice easy to read number doesn’t mean it is correct. I had a digital gauge at work that got dropped. Still read a value, but when we checked it against a standard it was reading about 80 psi off. Very linear and repeatable, but off.

 

[Gerry52]

I have 3 pressure gauges in line between my compressor & tank. None read exactly the same but are within 100psi of each other. I just use an average between the 3. Been in the fire protection equipment business for over 30 years & feel "more than safe" doing that. Aside from luck, the only way you'd ever get the exact same reading is by spending hundreds on precision gauges. There's a large enough window of safety built in to our equipment for me to feel safe averaging it out. Just keep your face away from fill hoses/fittings while working with this stuff!

 

[JDGriz]

Unless you have the gauges tested against a standard, you really can’t trust any of them to be correct. Kind of like the old joke about a man with two clocks….

Even the digital could be off. Just because it gives a nice easy to read number doesn’t mean it is correct. I had a digital gauge at work that got dropped. Still read a value, but when we checked it against a standard it was reading about 80 psi off. Very linear and repeatable, but off.

My main worry is that the mechanical ones drift. A piezoelectric sensor should be repeatable, unless something major happens.

 

[Sawney Bean]

If it really bothered me, what I'd do is take it to a dive shop and see if I could get them to do a comparison to their equipment. Preferably sometime when the place is empty and they've got nothing to do. I'd bet an industrial gas supply or hydrotest facility could do the same thing.

 

[Nomadic Pirate 66]

One thing that I found is that pump gauges seem to be more accurate then gun gauges

 

[Chukar60]

I just go off the gauge on my compressor to fill bottles and the gauges on my bottles to fill my guns. Kind of a descending line of trustworthyness.
Most gauges you find on guns are low quality.