Hi there, just a suggestion, have you looked at the back of the bell housing, there is a small hose with a snap on fitting twist and pull (the fitting is mostly yellow in colour) the tube attached is what sends pressure + to the speedometer. You should check it may be broken, disconnected or blocked. You may also have a leak in the tube. You could also try disconnecting the tube at the gauge, fit a test tube and blow/suck see if the speedometer movers I have checked a gauge in the work shop these ones take a lot of blowing by mouth, (blowing increases the speed reading on the gauge)
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