Yesterday, I was rooting around the engine compartment to look for the resistor that retards the ignition by 6 degrees (found it eventually) but in the process found a box that I have no idea what is for. It is behind the cheezy black cover behind the battery. It is a black box that looks kinda like the DME unit, but has a knob on the top of it that can be selected to position "0" or "1". Right now it is on "1". What is this box? Thanks -- Mikey