I have built the speed pulse generator, but have not been able to get it to work yet.

There is a person on tundrasolutions that has a TCH who got it to work. His post is in the tundra section as that is where this mod came from.

By just adding the switch to the speed sensor wire and disconnecting the sensor, you can buy yourself about 2 minutes of override time. This might be enough to fiddle with the nav, and if you need more time, just cycle the switch.

I still want the spg, so I don't have to cycle the switch to get more override time.