Yes, you have a vehicle speed sensor, but it doesn't drive the speedo. It generates a speed dependent frequency voltage signal to the ecu for fuel control (decel fuel cut) and to the cruise control speed input.
The speedo is cable driven, and you need a different count speedo drive gear that goes in the speedo cable attachment assembly at the tranny/transfer case at the under car end of the speedo cable. The different gears have different tooth counts, and are retained in the housing by a driven roll pin, and sealed with an oring. Housing is held in place with one nut on a stud holding a metal fork that presses the housing into the tranny case, also sealed with an oring. Remove cable feom housing. remove housing from tranny. count gear teeth. Say count is 26. Measure center of axle to ground on old rear tires. Measure same on new tires. divide a into b. if old tires are 31, measurement will be about 15.5, and new will be about 16.5, and division would yield about 1.065. DIVIDE 1.065 into 26 tooth count - 24.42 teeth required on new driven gear, so you buy a 24 tooth new gear from Mitsu. Most all mitsu's with cable use the same fitting gears, and the hard part is finding the right model to look up. Might try 2wd late pickups with the 4.222 diff. Use new orings, too.
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