1) Does anyone know what the two silver tabs that stick out to the side on
the back of the speedo(on a 90 GL Cluster) attach to?  They appear to be the
male end of an electrical connection.
2) I have looked through my Bentley for information on checking the tach but
cannot find any info.  Is there a simple way to check and see if a tach is
bad or not?  
Thanks for the help.
Coop