When I got the 74 - the transmission shift indicator was stuck in the "L" position and did not move at all. During a visit of my friends Lucky and Steve we took the speedometer apart to get access to the mechanism. A small plastic part was broken and the spring which is attached to the dial indicator could no longer work. I could glue it back together with a special plastic glue and put the spring back in place. Its now working again as it should.
The stuck indicator at the L position
You have disassemble almost the whole speedometer to be able to access the transmission selector dial mechanism. A small part was broken and therefore the spring behind the indicator could no longer work properly
The rest of the speedometer could stay in the car