Reply to "Mechanical Oil Pressure Gauge"

JB's suggestions are good. You may be expecting too much here. Any gauge that has a fast response time will have needle-shake. Ones with an electrical delay-loop won't, but you also won't see oil pressure fluctuations, either. A glycerin-filled mechanical gauge will damp the needle-shake at low rpms to some extent, but remember, the gauge is at the far end of a long, convoluted oil passage full of openings- like 16 lifters and the rod/main/cam bearing passages all opening and closing! An accurate gauge WILL fluctuate until the rpms come up. FWIW, my non-glycerin-filled mechanical gauge is mounted directly to the tee fitting on the rear of the block & the needle has vibrated since I mounted it.... in 1992. No problems yet.