The real deal, an original VDO 10K tachometer and NOT a conversion, never installed, just needs a bit of cleaning and a new bezel. The back of the instrument indicates 30000 Imp (Impulses) https://pbase.com/9146gt/image/134241000 which means it was originally a 10K rpm instrument and not a conversion https://pbase.com/9146gt/image/47215258 (24000 Impulses indicates an original 8,000 tach), here is another reproduction sample https://pbase.com/9146gt/image/47215067

A link to a reproduction 10K Gauge for sale http://www.early911sregistry.org/forums/showthread.php?74226-10k-Gauge&p=560563#post560563

Just because the face of the VDO instrument shows the correct p/n 901.741.302.06 https://pbase.com/9146gt/image/134240982 it doesn't mean it is an 'original' 10K tachometer*. Try modifying the back of the can to show the stamped 30000 Impressions, now that's just a bit more difficult. lol

* Feel free to give the guys over at North Hollywood Speedometer http://www.nhspeedometer.com a call 818-761-5136. Hollywood Speedometer has been servicing and restoring VDO gauges since 1955!