Speedometer

So while driving my dart around the speedometer likes to go all over the place for its reading on the speedometer, and also like to rest on 80 when the car was off. I’ve swapped out the cable and now it reads 20 with the engine off. I haven’t been able to drive it around since swapping the cable to see if it’s only an issue while the car is off due to other things I am fixing/swapping. When I swapped the cable I didn’t use lube because I didn’t know it needed it till 5 mins ago (got bad advice), but the cable is tight and there are no kinks but it does have a few good turns in it due to routing it to the trans. It’s a 1971 Dodge Dart swinger 318 and the new cable I purchased was the cable classic industries told me was correct for this car. Thanks in advance for the help!