I want to mount my new shift light on top of the dash - is there anything underneath the vinyl that will offer a solid mount to use some screws or should I bolt it?

Also, what might be a recommended rev limit for a mostly stock GTI engine? Redline is somewhere around 6700 I think, do you guys usually set the light to come on a couple hundred rpm before the redline?

Thanks,
PJ

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83 Rabbit GTI - future ITB