Russell Performance 100 psi fuel pressure gauge black face chrome case (Liquid-filled)Engineered for the serious street enthusiast, these gauges guarantee precise fuel pressure settings from 0 to 100 psi. Each comes with an easy to read face. These gauges have a chrome plated steel case with 1 8" NPT male inlet. Available in both liquid filled and non liquid filled models. Designed to withstand severe vibration to extend service and performance for automotive and marine usage.