Re GAUGES,  I am wondering if anyone knows of a tach or tach add on that would buzz or issue some other warning if a certain RPM limit was exceeded???  Every once in a while, my van gets driven by a non-VW person (heaven forbid).  Instead of being paranoid about the natural tendency to over-rev the engine by such drivers, I would love to have some device that would do this 'monitoring.'

Thanks,
Scott