Make sure you also have F8DC4 plugs in that motor.
Plats don't like that 104 engine. The F8DC4 are cheap, too..standard Bosch plug. Can get them here with the plug connectors.
http://catalog.worldpac.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=21H0MN3YU2A910G9G7&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1995&product=F1010-84561&application=000357354
Also, check the connector plug the OVP plugs into..they can get burnt up from the OVP not being completely plugged in all the way..you have to hold the plug from the bottom with your other hand to make sure there is a good snap connection b/c the socket is not secured to the chassis panel as one would expect....common mistake made when one changes the OVP .