Failed oil press gauge

[Scott Forman]

As you may have read last week, my coach wouldn't start. One rebuilt
starter later, everything is fine...except that now my oil press gauge,
which worked fine before the starter problem, is now alternating
between pegged right and pegged left.

Any ideas on how the removal/installation of the starter could have
caused this? What to troubleshoot?

Scott Forman
86 PT38
Memphis