Wiring a tach on a 1975 Johnson 135 V4

[old islander]

Does anyone have a wiring diagram for adding a tach to a V4 Johnson, 1975 vintage? I'm not sure where on the motor to pick up signal.
Any help appreciated.

 

[emdsapmgr]

On these old crossflows, the factory made provision for supporting a tach. The wire harness inside the control box should have a wire end left cutoff inside the box. Grey in color. If you open the box and draw the wire end through the hole in the bottom of the control box-that's the wire you need. That is the signal wire to drive the tach. Any marine tach. Just add a positive and negative power source. You may want to connect up the light for the tach also.

 

[gm280]

Good info above from emdsapmgr. you may have to set the pulse number setting on the back of the tach for your engine though. JMHO!