hey guys does anyone know what can cause the needle on an autometer boost gauge to flicker.
I'm trying to measure exhaust pressure, I have 4' of copper line and the remaining line to the gauge is plastic.

My boost gauge measuring boost works perfect.

Any help would be appreciated.
onetun

 

i dont know for a fact but could it be the cylinder pulse???

 

some of them do flicker, sometimes it is the gauge or the line is pinched

Mine does flicker

 

So is the reading accurate?

 

i flicker only when am in 4th gear wot.

 

Are you trying to read exhaust pressure in the exhaust manifold, before the turbo inlet? If so, I would expect some pulsing. Never measured it, so I don't know exactly what it would look like.

Tony

 

pretty close, I think