1998 Johnson Evinrude "EC" 90, 115 SPL Service Manual, P/N 520209, Page 251Get this manual
Dash Connections, Instrument Harness 3-pin connectorConnect to trim switch located in the handle of the remote control or to trim switch mounted on the boat dashOn models without power trim, protect the open connector by installing 3-pin plug, PIN 586072 (not supplied)6-pin connectorConnect to prewired remote control or to dash-mounted key switchBlack, purple, whitetan wiresConnect to the trim gaugeOn models without power trim, leave the protective insulation on whiteltan and purple leads8-pin connectorConnect to inSystem Check gauge or to inSystem Check tachometerIf neither gauge is available, install an Audible Adapter, PIN 1764582-pin connectorMust connect to the warning horn in all nsta IlationsBlack, purple, gray wiresConnect to conventional tachometer when System Check tachometer is not usedLeave protective insulation on the purple and gray wires if you do not use themIliiL