hi all,
my speedo needle does alot of shaking between 5-40 mph. about 8 yrs ago i replaced the speedo cable with a new one. didn't solve anything then so i'm finally trying to track this problem down.

what's invloved in a speedometer head replacement? is it a diy job? are there "calibration" issues i need to know about?
-b

4.2 '87 yj, 263,000 miles, mopar mpi, 33" mud bfg, skyjacker 4", 3.73 gears, arb lockers-f and r., tom wood's 2.07 shaft conversion, tom wood's hd driveshaft, magnaflow/custom exhaust, 4wd bumper/swing-out tire carrier