Speedometer is driving me crazy- Something is Wrong

I got in trouble with the wife one day when we were cruising her dart and the speedo let out a scream akin to a monkey high on meth.
She about changed lanes instantly.
Scared the crap out of her.
Yea, I laughed.
I heard that same monkey in Bazza's '71 VG, and because of all of the work I had just done on it, it scared the hell outta me!

Bazza just laughed when I told him about this, and he said it's been that way for years.

I called him an a**hole.

He just laughed again!