Part# KB-FPG-7PSI-OILF ; Kustom Bitz fuel pressure gauge is oil filled for accurate and reliable operation. 0-7 psi range is perfect for engines running a carburettor. This is a mechanical gauge and it operates in line to measure actual fuel pressure.

These in line fuel pressure gauges are a perfect diagnositc tool, permantly installed in your engine bay so you can see instantly what is going on.