OEM PART NUMBERS:
Mercury: 852087, 852087A1, 852087A2, 852087A3
Mercury: 91-881834A1 / 881834A1
Mercury: 91-852087, 91-852087A1, 91-852087A2, 91-852087A3

SPECIFICATIONS:
Type: Dual Fuel/Air Pressure Gauge
Function: Simultaneous fuel and air pressure testing
Connection: Schrader valve test ports on fuel and air rails
Platform: Mercury DFI Optimax, Verado, DFI Sport Jet
Weight: 2 lbs
Condition: New

APPLICATIONS:
Mercury DFI Optimax Outboards — All HP ratings
Mercury Verado Outboards — 135, 150, 175, 200, 225, 250, 275, 300 HP
Mercury DFI Sport Jet
All Mercury outboard models equipped with schrader valve fuel and air test ports

⚠️ Verify OEM part number from your original unit before ordering to ensure proper fitment.

Fuel/Air Pressure Gauge — Mercury DFI Optimax Verado Sport Jet
Diagnostic dual pressure gauge for checking fuel and air pressure simultaneously on Mercury DFI Optimax and Verado outboard engines. This essential marine diagnostic tool connects directly to the schrader valve test ports located on the fuel and air rails for real-time pressure monitoring. Critical for troubleshooting fuel system performance issues including low fuel pressure, air compressor output, regulator diaphragm failures, and fuel-to-air pressure differential problems on Optimax DFI engines. Also compatible with Mercury DFI Sport Jet applications. The dual gauge design eliminates the need for separate testing of each rail, significantly reducing diagnostic time. Replaces Mercury 852087, 852087A1, 852087A2, 852087A3, and 91-881834A1. New unit built to OEM specifications. Always verify your part number before ordering to ensure proper fitment. New aftermarket unit built to OEM specifications for reliable pressure readings. Always verify your OEM part number before ordering to ensure compatibility.