1995 Johnson/Evinrude Outboards 40 thru 55 2-Cylinder Service Manual, Page 116Get this manual
Troubleshooting Test Equipment
The following equipment is available from various manufacturers to support your ignition and electrical system troubleshootingManufacturer ordering addresses are on the rear inside cover of this manual
OJ Spark testers :
Stevens NoS21, S13C, or S48 Merc-O- Tronic No55-4S or 55-6S