yikes here's a 1992 on ebay but it's high, I'd say the 1993 would do just as well buy it at a cheaper price but either way this is the type manual you need.
1992 150 175 HP REAL EVINRUDE JOHNSON EN SERVICE MANUAL *
http://cgi.ebay.com/ebaymotors/1992-...28797371QQrdZ1