QuickCar's Redline Fuel Pressure Gauge is a 2-5/8" electric stepper motor gauge that features an adjustable warning level. The warning function changes the back lighting from white to green and flashes. The lightweight plastic casing is perfect for high performance uses. Gauge includes mounting hardware. 69-000 does not include 0-15psi sending unit (Pt.# 63-240) that is required for the gauge to function.