stationary speedo needle

[hocky1]

Been having this sad situation for the last month. Don't want to get caught by speed traps or the cops because it lasts for a short time only, the needle sticks to the end post like there's glue on it. At a certain speed, possibly 40kms as someone tell me( a techie), the needle will burst forward and register the right speed again. What the hell! How can I fix this cheaply without replacing the whole cluster or speedo. I also think my speedo is not accurate because everyone seems to be overtaking me in a 100kph zone and I look silly. The only 2 highway speed check gantries are 100kms away in 2 opposite directions from where I am. I can try this or is there another easier way???