Speed Continuously Changes Up & Down

1. Ensure proper operation of actuator linkage. If satisfactory, proceed to step 2. If not satisfactory, service or replace actuator linkage.
2. Check operation of speedometer cable for proper routing and ensure no sharp bends or binding exists. If satisfactory, proceed to step 3. If not satisfactory, service or replace speedometer cable.
3. Ensure proper operation of sensor. If satisfactory, proceed to step 4. If not satisfactory, replace sensor.
4. Perform tests on speed sensor. If satisfactory, proceed to step 5. If not satisfactory, replace speed sensor.
5. Ensure proper operation of vacuum dump valve. If satisfactory, proceed to step 6. If not satisfactory, service or replace as necessary.
6. Perform tests on amplifier. If satisfactory, proceed to step 7. If not satisfactory, replace amplifier.
7. Examine all connectors to ensure proper contacts.