I had the same issue with my 93 Ford Tempo, it turned out to be a governer gear in the tansmission that would cause it to spike the speedometer. If you get it looked at quick you will save lots of cash.
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? (?????)
To replace the speedometer cable on a 1993 Ford Tempo, start by disconnecting the negative battery terminal for safety. Next, remove the instrument panel by unscrewing it and pulling it out gently. Locate the speedometer cable at the back of the speedometer, disconnect it, and then trace it down to the transmission, where you’ll need to unscrew and remove the cable from there as well. Install the new cable by reversing the process, ensuring it’s securely connected at both ends, and then reassemble the instrument panel.
To change the speedometer from kilometers per hour to miles per hour on a 2012 Toyota Prius, start by turning on the vehicle without starting the engine. Press the "Setup" button on the dashboard, then navigate to the "Vehicle Settings" option. Select "Units" and choose "Miles" to switch from kilometers to miles. Confirm your selection, and the speedometer will now display miles per hour.
bouncing
the LACK of LUBE or Graphte on the speed0 cable IF it's not an electric sending unit type. The speedo cable spins inside another cable. Moisture will cause rust after a few years and this will cause the speedo cable to start to drag and release. If you remove the cable from the back of the instrument cluster and squirt in some graphite, this should help with the bouncing.
To change the speedometer of a Mazda RX-8 from miles to kilometers, start by turning on the ignition without starting the engine. Then, press and hold the trip odometer reset button located on the instrument cluster. While holding the button, turn the ignition off and then back on, continuing to hold the button until the display changes from miles to kilometers. Release the button, and the speedometer should now reflect kilometers.
According to the Big Book of Rock, it has a tempo of 146 BPM
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Tempo.
its a 1994 cavalier the speedometer runs on its own and will not start it starts when the speedometer is not running it has the vs sensor
If it is the same problem that appeared on my '04, it is going to be the instrument cluster. The speedometer is part of it and couldn't be changed independently. Mine started bouncing some when I would first start it up, then start working normal. I ignored that for a while. Then it got to where it would not move at all till I had driven some , then it would start working right. It finally got where it wouldn't move at all or just peg out. I had the cluster changed and that fixed it.
You can never over fill it with gas. It might be possible that the fuel pump in the tank has quit on you. It might be other problems also, electric...........and so on.