here's 2 of the manuals you need. the EN which means 92 is actually the one you need but these should work.
This one is a JOHNSON EVINRUDE FACTORY SERVICE MANUAL EI 60 degree LV MODELS 150 175, the EI means 1991 Manual
http://cgi.ebay.com/ebaymotors/JOHNS...QQcmdZViewItem
This one is a JOHNSON EVINRUDE FACTORY SERVICE MANUAL ET 60 degree LV MODELS 150 150C 175, the ET means 1993 probably better for you than the 1991
http://cgi.ebay.com/ebaymotors/JOHNS...QQcmdZViewItem