Rob,
you have a volt meter, your speedo probably goes up in 2k increments, the headlight adjust knob will be tucked into the right hand side over the rocker cover under the right enine panel. The No 6 switch is to dim the pole light on the police bike.
At a guess, some one has repainted the bike and replaced the right switch block. Under the seat at the rear will most likely be a bundle of strange connectors, used for the police electronics pack.