[Chilibit]

It is a very recent SPF. The knob will not rotate to reset the trip mileage. Likely the speedo will need replacement. I can feel one knurled knob on the rear of the speedo (maybe at seven on the clock face). I suspect there is at least one more. Once they are removed and the knobs fall into some crack never to be seen again, does the speedo unit exit through the front of the dash? There appears to be only one path to the back of the unit, up from the driver's side. Unless removing the 12 volt plug helps matters. In 1966 I fiddled with Smiths on an MGB. I have come full circle.

TIA

Vince