Different gauge reading

[Jscott051966]

When the gauge on my cs4 compressor reads 4350 psi the gauge on my avenge x reads around 3950 psi.
Is there a way to find out which one is correct?

 

[3Crows]

One problem is that quality gauges are generally 1/4 NPT or 1/8 NPT and the fill hoses and what not many of us have use M10X1.0 threads and I do not see an adapter for going from M10X1.0 female to 1/4NPT male. My fill whip I converted to slow fill and installed a larger M10X1 gauge and then checked the tank fill using a gauge I trust a bit more and found they basically agree. Oddly, the little button gauges on my rifles agree with my whip. The China gauges on my YH and which the same that I removed from the whip read 400 psi low!

 

[Gfaust8]

That looks like a Joe Brancato fill setup. High Quality