[tirwin]

I just looked at the Bentley. It looks like to me that the switched power from the ignition switch comes in on fuse 12 and is bridged to fuse 11 where it connects to the CDI on circuit 15. The tach also has a connection to circuit 15. And the tach is also directly connected to the CDI via the black/violet wire. If the switched power for the radio coming off the ignition switch is also circuit 15, then I think we have found a commonality. I just can't confirm the radio yet.