The back of the can in this instrument indicates 15000 Imp (Impulses or Impressions) https://pbase.com/9146gt/image/43237066 and not the expected 30000 Imp associated with original VDO 10K tachometers. I will have to do a bit more research to confirm its authenticity.
10,000 rpm Tachometer, p/n 901.741.302.06 as used on the 1967 Porsche 911R - Photo 3
10,000 rpm Tachometer, p/n 901.741.302.06 as used on the 1967 Porsche 911R - Photo 4
10,000 rpm Tachometer, p/n 901.741.302.06 as used on the 1967 Porsche 911R - Photo 5
10,000 rpm Tachometer, p/n 901.741.302.06 as used on the 1967 Porsche 911R - Photo 6