speedometer question

my buddy called me yesterday and told me that his 89 rs speedometer is jumping up and down, he said he did a serious burnout and ever since his needle has been jumping up and down, he has a 700r4 so do you guys think he has to tighten up the cable or what.

Lube it or replace the cable & housing.

yeah id say its just dry, my moms 85 z28's speedo hand used to float like that too.

could a dry speedo cable also make it stop from workiing cuz my speedo also used to do that until i maxed it out and now it dont work anymore