One legged if it will.
Had an issue with the speedometer and tach. I did the calibration. supper easy. I had 2 friends and one random guy stop to see if I needed help. Another called me because he turned around to see if I need something, but I was gone. Parked in the shoulder to start the 2 mile run and stopped in the shoulder to do the final set. Did it twice, I was not happy with the first attempt.
The speedo would bounce up abot 20 MPH for just an instant. Notice the tach, that is very small, was jumping 500 rpm. Not doing it together. Speedo would randomly bounce sitting still. I figured some kind of interference. I would look at it when I got home. It backfired through the carb under acceleration 5 times on the journey
@Bent77 . Seemed to be vibrating a lot and under horse powered. Idled slower than normal. Sitting at one of the lights I could here a random ticking noise. Noticed it coincided with the tach jumping. OK. A plug wire or the cap is bad.
Drove it home. Vibrating under acceleration. Gutless. I am not happy.
Now in the shop I pop the dog house off. Close the shop doors to make it dark. Fire the truck up and I can see sparking inside of the cap at number 6. Get the tools to pull the cap and I look down as I am climbing in. Number 6 plug wire is hanging over the transmission. Not on the spark plug. When putting the dipstick back in, the dipstick doing the work did not put the plug wire back on.
Have I mentioned how bad my mind has been?
It is fixed now. That was easy, but unnecessary.
The dash is not screwed in because I still have to feed the cruise control.

