I have just fitted a combination speedo/revcounter.Acording to the instructions to adjust the color of back lighting turn ignition switch to accessory position.press and hold trip reset button ontil odometer reads color.Release the reset switch.Click the trip reset switch to scroll through avalable colors using course adjustments in +20 increments.Press and hold trip reset switch to fine tune colors.When the desired color is reached release the button leave powered for 5seconds color is set.When the color is set the word color will go out.This is how i set mine hope this helps.