Grader, I got it from this post regarding "does increasing engine RPM increase top speed":
RX-Dave
Extreme
joined: 14 Nov 2004
Posts: 103
Posted: Sat Jan 08, 2005 10:57 am Post subject:
On a note here, I tested my factory tach to a Digatron SN54, and at 10,500 factory tach RPM, it is running 10,200 on the Digatron. So, if it is running best at 10,5 - you are actually only spinning it about 10,2 - right where yammy says it is "all-good"
This is the first I had heard of this also. I had always heard the RX-1 Tachs were super accurate.
I had a digitron on my MSRX and it agreed almost perfectly to the one on the sled but on an RX-1 I have no idea.
Frosty