boost guage help

[niz55]

I installed a autometer black boost guage. I used the line it came with. I zip tie everything good. Now the problem is after 5 psi the needle shakes really bad. My vac is on 20-21. Anyone know why? I also have mazda speed cai. I hooked it up where the stock blow of valve goes. Cut the tube in half and put the T that came with it. It is boosting 17-18 psi but shakes really bad. Help please.

 

[Darksun280]

I installed a autometer black boost guage. I used the line it came with. I zip tie everything good. Now the problem is after 5 psi the needle shakes really bad. My vac is on 20-21. Anyone know why? I also have mazda speed cai. I hooked it up where the stock blow of valve goes. Cut the tube in half and put the T that came with it. It is boosting 17-18 psi but shakes really bad. Help please.

try switching out the line they give you. the shop that installed mine threw that crap right in the trash and used there own

 

[Hot Shot]

I installed a autometer black boost guage. I used the line it came with. I zip tie everything good. Now the problem is after 5 psi the needle shakes really bad. My vac is on 20-21. Anyone know why? I also have mazda speed cai. I hooked it up where the stock blow of valve goes. Cut the tube in half and put the T that came with it. It is boosting 17-18 psi but shakes really bad. Help please.

It's common on mechanical boost gauges to get buzzing in the lines like that. There are a few companies that sell no buzz T-fittings that will eliminate that. Search and you should find one pretty easily.

 

[SharkDiver]

My line has a little brass insert that makes the hole even smaller.I think that makes the gauge needle bounce less.

 

[Dr_Combustion]

You need a snubber. These are available at industrial supply places like Granger or McMaster-Carr. A local valve and fitting business should also carry them.