Speedo problem

[f.monroe]

I had to replace my speedo since it was way off . It showed about 90 when going 70 . Since I had to replace that part , i just installed a tach cluster while I was at it . Everything works fine and the speedo appears to be correct . It is at 70 when I am at around 2500 rpm .I measured a 10 mile stretch with my 2005 work truck and then checked the odometer in the new speedo . It registered 10 miles also . My question is .... is there a way to lubricate the speedo since it squeaks like crazy and bounces a little ? It isnt the cable since it was quiet with the other speedo . I will probably take it back apart this weekend and remedy the squeak . If it is possible to lube it , what works best ? Thanks .
Frank