Adapting original tachs with alternator setups

[Mike Rivers <beatlemikey@yahoo.com>]

Hi,

Has anyone run into the dillema of getting the old
cable-driven tach to work with an alternator setup?  I
hate to gut my original tach for electronic guts.  I
was thinking- My water pump pulley is the dual 1275
type.  My thoughts are acquring an old smog pump,
gutting that, and modifying it to accept the cable in
the rear.  There might be pulley ratio issues to deal
with, I know. Has anyone tried that?

Thanks,
Mike Rivers
1961 MG Midget 1275