I do not know what the problem is but I have a 1996 Buick Skylark that is doing basically the same thing. My dash lights and temp gauge were OK but my speedometer kept going up and down for no apparent reason. My Skylark only has 74,000 actual miles on it. Someone said that it sounds like I have water in my gas. I guess I will have to have it towed to a mechanic and let him figure it out. If you find out anything my e-mail is
vet.tony@gmail.com
Tony,
Peace,
People may forget what you said,
People may forget what you did,
But people will always remember how you
made them feel.