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Its a prosport fuel pressure gauge and it has instructions but very simple one's which are "Red 12V accessory power" "Yellow accessory power on" which are the two im kinda of stuck with but obviously i know ground headlight switch and etc but im not good with electronics so just kind of confused on where the accessory wire are supposed to go to...
Not sure without seeing a diagram but I would think the red should go to a switch 12v source and the yellow would go to the headlight/parklight so the gauge would have a backlight when lights are turned on.