2007-2013 INSTALLATION GUIDE GlowShift.com © GlowShift Gauges, LLC | All Rights Reserved GMC SIERRA CHEVY SILVERADO DURAMAX 6 1. Remove the air intake piping inside of your engine bay with a flat head Screwdriver. 2. Using a flat head Screwdriver or Pick Tool, remove the fuel rail pressure connector. 3. Optional: To avoid splicing into the factory wiring harness, purchase and install the Fuel Rail Pressure Gauge Wiring Harness for easy install. 4. Plug one end of the rail pressure harness adapter into the factory rail pressure harness. 5. Plug the other end of the rail pressure harness adapter into the factory rail pressure sensor. 6. If a rail pressure harness adapter is not being used, splice the green signal wire to the factory Rail Pressure Sensor Wire, and splice the black ground wire to the factory ground wire. Refer to the chart below for your vehicle’s wiring colors. 7. Route the rail pressure gauge harness to an available opening on the firewall, securing it with Zip-Ties. Make sure there is no contact with any direct heat source or moving parts. Rail Pressure Gauge Installation SECTION 5 YEAR SIGNAL WIRE GROUND SWITCH POSITION 07-08 Yellow Orange/Black 1 and 2 Up 09-11 Orange/Black White 1 and 2 Down 12-13 Yellow Orange/Black 1 and 2 Up Rail Pressure Gauge Settings 1. 4. & 5. 7. 1 2 ON
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