In 1966, just after I had bought my Super Hawk (1966 R1 GT Hawk) I ran across a buddy, a sports csr driver, who wanted to take it for a ride. I went along wiith the idea and with the car. Richie was a good driver, but I thought he was approaching a curve a bit too fast, but said nothing. We went over a low curb and sliding across a long field of grass. We came close to a huge stone tower monument to an explorer who had visited there shortly after the Pilgrams came. When we stopped, he sat for a second and exclaimed, "Oh, That's a 160 MPH speedometer!"
He had put the needle at the usual angle on the dial for going through that corve with his MGA so he was going quite a bit faster. Take heed when you let others drive you car at night after a few brews.