Vehicle Speed Sensor effect on tuning

Just read that last night. The sensor reading vs actual mph was off 10 mph. He had many issues going on, and I'm sure most they didn't write about, on purpose or not. I worked at a shop years back where we put out quite a few cars that were in national magazines. Boy what a wake-up call to the world of car magazine stories that was !!!! Either the people that owned, worked on, or presented the cars had amazing imaginations, or the magazine writers did !!! (I believe the magazines were duped most of the time, and weren't sharp enough to check/catch it, or didn't really want the truth). These were cars that won a lot of events, one even was Hot Rod's car of the
year. I do not believe much of what I read in them anymore. Anyway, that guys truck was going into OD lock-up at 35 mph, and he would just lug the thing around town like that. This compounded his other issues. You would think if you put together something like that, you would notice the early lock-up and MAYBE shift the thing out of OD during around town driving !!!!! No way that system leans the engine out to the point of melting valve guides strictly on an erroneous vss signal. Map, O2, ETC, IAC sensors might have something to about that. On that system VSS signal, or lack there of, is used mainly for trans operation and idle conditions, I believe.