GlowShift LED Shift Lights are the perfect way to know exactly when to shift without relying on a tachometer or your instrumental panel. These shift gauges range from 3,000 to 12,000 RPM and work with any 4, 6 or 8 cylinder gasoline vehicle. Any adjustments can be quickly and easily made with one turn of a knob on the back of the light to change the RPM setting. Two LED colors, red or blue, are available with the option of either black or silver housing. You can also add an LED Shift Light Cover for any time the Shift Light isn’t in use.