There was a post awhile ago about installing a speed correcting device behind the gauge cluster. The electrical box seemed to be a frequency multiplier so you could fix the speedo reading wrong from gearing/tires/etc. I am trying to find the post so I can see which is the wires going to the speedo they spliced into.
Follow Ups
Anyone know where to find the writeup on speedo fix? - sbarge22:41:00 01/03/07