Is your dizzy wired up properly? Is the engine earthed properly?
No idea about the dash swtich? I'd try and chase the wiring - may be some form of ignition cut off, but not standard.
The wire to the Carb looks like a fuel cut off solenoid. Looks like you have a cable choke.
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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