Bob, Sam, Mark, Chris and the Archivists,

Thank you very very much for your help with this.

After carefully pulling out the connector on the back of the speedo,
I bent the outermost pin (the ground according to Bentley) aside.
The connector was fitting back in, but real tight.  I filed a shallow
groove in the adjacent plastic and was able to bury that pin a little
which made for a smoother fit and, if necessary in the future, a more
likely extraction.

Sweet, sweet relief!  Now, the alarms are off AND the oil lamp lights
when I turn the key on.

Thank You Very Much,
Mike