I'm a newbee here and just roaming around the site I see your post.
Although I have neither the Olympus camera or this Sunpak flash I can point you to an interesting pdf file. It is related to dedicated Sunpak flash on Olympus cameras. Just a bit of interpretation on reading the file is required...
First, Here's the link to the pdf: http://www.cameramanuals.org/flashes...ace_module.pdf
Go to page "OT-1D FOR OLYMPUS CAMERAS"
Automatic operation: Second line, "Mode selector switch"
Set the Mode... to the ' * '
Substitute one of the colored choices, Yellow or Blue, in place of the ' * '
Continue on from there and I believe you will get along just great.
Sometimes I'm brilliant, but most times I'm just myself.