12-01-2018, 01:57 AM
I had the same problem as Dave with a Hillman Minx after a 800 mile run around Ireland, by the time we got home the speedo would read 80 MPH as soon as the car moved. I stripped down the speedo head and gave it a good blast of WD40 and stripped, cleaned the inner and outer cable and with a light oiling and all was working as normal.