1998 Johnson Evinrude "EC" 90, 100C, 105C, 115, 150, 150C, 175 60 deg. LV Service Repair Manual, P/N 520210, Page 298Get this manual
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Tachometer Circuit Tests
Important
Verify that all engine and boat wiring and connectors are in good condition
INote Do not energize the primer while performing these tests 1