Mike,
Those wires run back to the transmission mode switch connector M-25. They are for the clutch pedal switch. If I remember correctly their purpose is twofold: 1) the the starter interlock that doesn't allow the starter to engage unless the clutch pedal is fully depressed, and 2) the cruise control will function when the pedal is out and disengage as soon as the pedal is depressed. One of these uses a N.C. and the other uses a N.O. switch position. I wired my VX differently and did not run any wires through the firewall. In my case I left out the starter interlock because I don't care if I can turn it over without depressing the clutch. To do this you must short pins 1 & 4 at M25. However, this does allow the VX to be cranked over while in gear with the clutch engaged. I just don't find it that difficult to make sure I'm in neutral before cranking the engine just like all manuals in the not so old days. As for the cruise control clutch interlock I ran two wires from the clutch switch behind the dash over to the cruise control module behind the passenger kick plate. This was easier and cleaner in my opinion than running wires out the firewall to the transmission mode switch connector.
Send me your email in a PM and I can send you a word doc with useful notes that I created.
Cheers,
Scott
There's no 'I' in denial.