OTC's 5868 Primer Port Fuel System Test Gauge is used to properly diagnose and repair fuel systems on heavy duty diesel engines. Gauge connects directly to the priming port fitting and includes 0-160 psi gauge, 12 inch flex hose, and quick-connect fitting. Applications include Detroit Diesel DD13 and DD15 engines. Crafted from high-grade materials to ensure quality performance over the lifetime of the tool. Similar to J-48876. Made in the USA. Value is at the core of the OTC tool and equipment portfolio. Whether it’s a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it’s a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians’ productivity and shop profits.