Just swapped the gauges, got a nice sr5 cluster. I took out my milage barrel and swapped it with the sr5. I now have the correct mileage (and same exact part) on the new cluster. Everything seemed to work fine, my truck was already wired for a tach, just plugged it in. Took it for a test drive and the speedometer is totally messed up. starts at 0 then goes up to - uh faster than I am going and wont come back down when I stop.. Maybe a minute goes by and the then its back at 0. Please - someone - help me here. Any suggestions.?

88 4runner 22re 5spd 30x9.5 bfg AT
daily driver - weekly off roader.
284,400= Jasper - hello 5th gear!
true Thorley Header - V6 3rd
Valid inspection sticker (289,000)