Pretty sure it was a Fury, the 55 was my first car when I first started driving for about 4 years till I got the 67 Barracuda from my grandparents in 1985.
Alan
In the rear, the CHP in 69 only had a steady red (spot light) to the front, and flashing red or amber to the rear.
This was about 90 days before I finished the car.
Alan
Maybe not the drag strip, my CHP Polara, screen capture from a video taken during one of the first shakedown runs. Wasn't even going that fast, maybe 55-60 but there was a dip.
Alan
In my Barracuda (a street cruiser) my Vacuum gauge is number one, speedometer second, others cursory glances.
I'm all factory so not much value here.
Alan