speedometer cable needs to be replaced what do I do under the dash?

If they still sell the inserts, just remove cable at transaxle - pull the cluster - replace the cable insert - reinstall cluster. Haven't had to change cable housing in years.

I concur with professorg, its rare to have to replace the cable itself, if indeed, it even has one that goes to the dash. Many gages now just receive an electric signal that controls the needle. But if it does have a cable, I would check the tranny hook up first. The cable there usually goes into a square hole in a PLASTIC gear. The gear will often wear out to allow the cable to slip, causing the needle to be jerky or not work at all. While there check the end of the cable for it's condition just in case. One note, make sure if you do replace the gear that the replacement is the exact same- they make different ones that can change your speed reading to match different gear ratios. Also if you do have a cable and you do need to replace it, you may be able to pull the cable out there and replace it with the new, assuming the cable sleeve is still good. But as I said early on, make sure you even have a cable that goes to your dash. The problem may be electrical, I had 98 & 99 neons, both had analog gauges that were ran by an electric sending unit on tranny with wires going to speedometer. Would like to know more info on your problem: is it constant, intermittent etc.