Sorry if this is not the right location for this but since it is focused on tachometers and someone might be using a Royal Electronics analog "ProTach" in taking their readings, I though I would ask my question here.

I recently was able to purchase a Royal Electronics analog "ProTach" in NIB condition. These are very hard to come by as they are no longer in production and due to their analog jewel movement, they don't survive if abused. This is the unit that Dave Gierke pictures and speaks of in his book, 2-Stroke Glow Engines for R/C Aircraft volume 1. In any event, I am looking for the manual/literature that came with the tach as the person I bought mine from did not have anything. If someone has a copy, I am hoping that they could .pdf it to me or we could find some other way I could get a copy.