I don't see anywhere that I said it fixed the problem, but to be fully clear it did NOT fix the problem. Maybe too much junk dropped in my eyes while I was under the car

Every once in a while the speedometer will jump to life for a fraction of a second or so, then dead again. I did look at the wiring and the wires are bent where it enters the connector, but I didn't see any broken wires. I will take it apart for closer inspection, but there is not much slack in those wires so there is not much to work with there. Assuming those check out do I just follow the wires up and keep checking along?