within the past 2 weeks my tach has been sticking if the engine goes above 3000rpm. it works fine untill it reaches 3000. then after 3000 it just jumps around almost sporaticly. all of my other gauges work great. has anyone else experienced this problem, or know of any way to fix it or am i just going to have to live with it? my tranny is an auto so im not too woried about it just nerveracking.