Is the 5.5mm for that pesky screw on the back of the gauge cluster,,,, can't think of the name of it,,, pale green box with three wires-red, black, and green. Some kind of MPH switch thingy 😕
thank you, thanks to ssn969 for reminding me I had it I would have being trying to think what I used it on all day, now I can just sit back and enjoy my coffee...🙂