2000 ford ranger manual speedometer not working?

I just got this truck, runs great but no speedometer. I got my boyfriend to change the magnetic speed sensor on the rear differential but did not fix the problem, the fuse looks good, and the connector under the drivers seat was ok. Does anyone know what the problem could be? All of the other gauges work just fine.

TAKE IT TO A SPEEDO SHOP

UPDATE: Found the problem, the connector located under the drivers seat is corroded to hell. For anyone else who has this problem check the connector, apparently these are infamous for getting water in them!

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