Lang

I just received that glow gauge for my dash and took a look at the online instructions.. they seem ok, it didnt come with any in the box...and online ones dont say anything about the switch...where is the switch supposed to go that turns it blue or green? I havent yet taken my dash off to look at how to wire this... but yea if anyone has some straight forward stuff about the wiring and placement of switch that would be nice cuz im am a rookie at messing with cars

also.. anyone know why when I slowly start out from a stop i get a light rattle sound from the engine.. like an out of oil type of sound..? it goes away once I start moving or push on the gas pedal harder.. but is really anoying at slow turns and starting out..

thanks