Boost gauge and hypermiling theory

[Rawze]

I installed my boost gauge when my truck was still new. My boost gauge has always had a bounce/vibration above about 33~ or so PSI since the day I installed it. it happens when I demand a lot of torque below 1500 rpm. I just let off the throttle a bit and it goes away.

It is caused by cavitation at the intake and it is quite normal on several different model trucks.

Demanding a lot of torque at lower RPM's is what usually sets cavitation in motion.

A factory boost gauge will hide this fact. Some brands of after-market gauges will hide this too.

It is just another reason not to demand such high torque at lower rpm's. If you need that much power, you should be in a higher rpm range for improved engine longevity any ways.