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I installed one of those Autozone fuel pressure gauges and its acting a little funny...I think...
The needle bounces quickly between 6 psi and zero. The faster I rev the engine the quicker the needle bounces, but still between 6 psi and zero.
Is this normal? A problem with the gauge? Or a problem with the fuel pump?
It's just a cheap gauge. Your fuel pressure will fluctuate as throttle opens and closes. The better gauges will have a steadier moniter of it, but it will tell you the same thing. 6psi