My initial idea was option 1. I liked the fact that the display would be correct. However, once the vehicle were stopped, the TOD would be thrown into confusion. So I abandoned it.

Option 2 is the most elegant, yet it is not reversable (easily), removable, or easily installed. I'm going to try to veer from this, but we'll see. My goal is to have a correct dash display, and 5 modes of operation: Auto, 2wd, 15, 30, 4hi. All selectable with a knob. I think that by keeping it simple (5 modes, or outputs rather than infinite) I can make the display work as well.

I would need to:
a) turn off the AUTO display when the knob is switched to any other position.
b) turn on the appropriate lights with each mode.
c) default to AUTO mode whenever 4Lo is activated -or maybe not. 2Lo is an interesting option, if it's even possible.

I guess that I'm looking at option 2.5. I want to be "inside" the TOD computer for the display benefits, but I want it to be accessable and easy for a novice to hook up.

I pick up a better (portable) scope this week. This weekend I'm going to pull the harness(s) off of the TOD computer and make extensions (to minimize my crawling under the seat) that I can easily tap in to. I have the workshop CD, I'll be looking it over tonight. I think that I have a few spare connectors around the shop.