Pressure Gauge Needle Vibrating

[srugman26]

What would cause the needle on my pressure gauge to vibrate. I'm not losing any pressure. It happens both when the machine is hot or cold. This is on a Boxxer 421. I've only noticed it a few times before but the machine had been running for awhile

 

[bob vawter]

problem is always air..............don you have the glycerin in yor gauge?

 

[daniel@procarpet]

The guage on my Everest does that. When I switch the machine from low to medium etc. the pressure drops almost to nothing on the guage but really doesn't drop. It goes up a little instead. If I set the guage at 500 on idle, on low the pin will vibrate a little but remain close to 500, but on medium or high the needle goes to 50-100 psi. Do I need a new guage or do they all do this?

 

[bob vawter]

doesn't ALL manufacturers use gauges wit glycerin in them......

i jus assumed!

 

[srugman26]

Actually it was the chemical syphon tube not being fully in the 5 gal solution container. So yes, it was drawing in some air. How stupid of me not to look first