I have a '69 AMX that the tach face markings (the orange or red)have faded out. What I would like to know what is the correct procedere to put the marks back to original color( are they orange or red or a combination).Instrument Services (a company that restores gauges) can do this but they will take 4 weeks to do it and I thought that maybe someone has done this and could be of some help.

Thanks,
Matador1