I've seen them around and am a cheapskate, so I figured I would make my own.

Basically they wire to power ground and in series with the VSS.

The way Im thinking is that it would have a knob to adjust up or down.

Anyone have any input or suggestions?

The only other feature I have seen is some have a switch with two knobs and you can switch it for people who run different tires in different seasons.

__________________
1998 Supercab XLT 4x4 4.0L Auto

Never thought about this before, but it "sounds" doable. I'd like to keep up with your experiment on this.

2005 2.3L XL Electronics Tech since '70's

__________________
2005 2.3L XL 5SOD 3.73 K&N
KYB Shocks Husky Toolbox
Alpine / Rockford Fosgate Sound

"Ask me about my AC Vent fix!"