Speedometer Gauge, Black Bezel, new original stock 0-160 MPH fits 1974-85 Avantis. Avanti Motors installed 85 MPH speedometers for about 5 years. This is a direct replacement for the 85 MPH speedometers, but you will have to change the plastic gears in the transmission , where the speedometer cable connects. Any transmission shop should be able to supply you with those gears and probably install them for you.
Speedometer & Instruments/Speedometer & Drive Parts 1716 1716-1