Well, in that case, here's a better setup for the manual switch:

You wire up a DPDT switch as shown in the diagram (wire end coming from transmission is marked in red, wire end going to PCM is marked in blue). Parts in gray are optional - red LED will light up when converter locks up, green LED comes on when you switch to factory PCM control. This switches between automatic and manual lock, it has no manual open converter provision, if you want the auto/off/lock setup that's a bit more involved.
As for the BOO switch interlock relay, I need to work on that too, really I need to get off my butt and draw the full-blown diagrams, and I've been meaning to do so for the last few days, but after the delayed-exit headlights mod today I don't have much motivation left