Speedometer calibrator
 

I just ran across while doing some searches for calibrating my speedometer. I wonder if this could be utilized to for the speed problem reported by many porsche owners. Looks like it can be adjusted on the fly so if you put on different size wheels you could just readjust.
I have no clue what all the numbers mean I assume ppm mean pulse per minute or some such thing. What do you think.

Calibrator

Many Honda owners can probably use something like this calibration unit.

http://www.freep.com/apps/pbcs.dll/article?AID=2007702190383

Come to think of it, Porsche speedos are pretty optimistic as well. I'm hoping PAG will extend my warranty. Before the Internet, compiling and comparing owner experiences would have been impossible.

Sherwood
('69 911)