I have recently aquired a 1958 DB. There are three lights on the dashboard...and 2 toggle switches. The left toggle appears to be the switch for the lights although my DB has been mis-wired so the headlights don't work. But what is the right (spring-loaded) toggle? And what are the 3 lights? Also...there is a small tank on the left. side of the gas tank which apperas to be motor oil...but the cap is in Italian which I can't read. I thought oil was added via the cap on the valve cover. Is this true or should it be added in the tank in the front which appears to be oil? Thanks.