I've got a 98 XJ 4.0 5spd. The odometer recently reset to zero. I drove approx: 108 miles, then it reset back to 98. Drove another 10 miles (108)then it resets to 98. "CHECK ENGINE" light is on now, due what the computer is reading. My question is: is this the gauge cluster or PCM? Archives showed some confusion on which is the problem. Some thought both, then some said one or the other. I'm leaning toward cluster, if you give the dash a adjustment above the cluster, with your fist, the fuel reading (which is pegged full) goes to correct reading (1/2 tank). Archives doesn't have anyone with SAME problem... Thanks all. RC