Proflows 40mm fuel pressure gauges offer reliable, affordable precision. Proper fuel pressure is critical for adjusting your carburetor or fuel injection to achieve top performance. Our analog gauges are available in a selection of styles,, sizes, and dry or liquid-filled, to meet your needs. Choose from Stainless or Black body with white or black face, these accurate fuel pressure gauges from Proflow is of high quality and a name you can trust.