No rotation on the tach it more a center piece than anything else looks really cool when illuminated, and I have a jaguar rear fully independent rear (IRS)no panhard bar needed.

1940 Chevrolet 3/4-Ton
"Project XJ-PU-V12"
In the Stovebolt Gallery
More pix on Flickr

In business, words are words, explanations are explanations, promises are promises, but only performance is the true reality.