So my speedometer in my 97 ranger dosnt always want to work right. what it will do is not work at all till i hit about 20-25 or so, then it kicks on, but is about 10 mph too slow (it says 35 im going 45). I replaced the VSS with a brand new one today, and it will still do the same thing. It dosnt always do it but id say 3/5 times it does. What else can i check to fix this?

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1997 Ford Ranger XLT extended cab.
204k miles
31x10.50xR15