Bouncy needle on speedometer

I disconnect the cable at trans end and take it out from under the little metal strap under floor so I can straighten that curve a little. Then disconnect at instrument and back out from under the dash and toward door opening. Flush sheathe with brake clean and compressed air. Wash wire cable well too. Then with tub lithium grease between fingers I coat the cable while working it back into the sheathe. It may still fight me at the curve but not so bad as would have been. I've never needed to service the same cable twice.