Good news and it is not about car insurance . Your vehicle speed sensor is acting up . VSS sensor . If your car has 100,000 miles or more then change the crankshaft position sensor with it , these are highly problemmatic .
Your speedometer bounces up and down because the speedometer cable is about to break.
A 1991 dodge dynasty speedometer bouncing could be a sticking speedometer cable, or a bad drive gear. Check the cable first, and lubricate it to see if the problem stops.
The speedometer cable is bad. It has a kink or a break in the line. I was guess a break from what you are describing.
One indication of a bad sensor is when your speedometer bounces around, shakey, or jumpy.
Most likely have to change the cable.
Try asking your question again - it makes no sense as presently written. If the vehicle won't start - then it won't run. If it won't run how can the speedometer needle be bouncing? (?????)
I would suspect the vehicle speed sensorSee "Related Questions" below for more
If it's cable driven, you probably need to replace the cable. Otherwise, if it's digital impulse driven, it's probably the speedometer itself.
nono
Bounces happened in 1985.
Bounces was created in 1985.
No. When light bounces it is not absorbed.