Well, if all of your dash lights work, than I doubt it is the connection on the back of the cluster... To check it though you need to take off the dash and then pull out the cluster... I think there are 5(?) screws holding both things down... It is not that hard, I just installed a cluster with a tach in my 1995 GL... But like I said, if the dash lights work then it may be something farther down the line
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