There were a few rounds of change between 86 and 91 including the service light lever mechanism. I am not sure it will work for you. No auto manual difference, but the year issue could be bad. The speedo electronics look different when you have them side by side. Mileage adjustment involves pushing the axle pin free and gently lifting the assembly free of the lower gears. You need patience to line up all the numbers and gears. If you claim to have surpassed Irv Gordon in mileage on your vehicle, you will be apprehended for adding too many miles!
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