bouncing/squeeking speedo

[chatcher]

i had the bouncy speedo prob my mechanic friend said the speedo was shot so i went to the junk yard and got a gauge cluster, swapped them and he was right now i just have the whole unknown mileage issue to contend with if i ever try to sell it
i did keep the original gauge cluster and wrote down how many miles were on the new one when i installed it hopefully that wil l sufice should i ever need to sell it if not though who cares what the dial reads
im gonna say its not the cable or the gear though your gonna need the gauge wether you get a new one from ford (expensive) or if you go the route i did