johnson rev counter

[Daniel]

anyone know what colour wire to connect a rev counter into on an old johnson 70 VRO ?

[Daniel]

OMC control box / keyswitch connections

BLACK (GROUND)
BLACK WITH YELLOW STRIPE (KILL CIRCUIT)

YELLOW WITH RED STRIPE (STARTER SOLENOID)
PURPLE WITH WHITE STRIPE (CHOKE)

PURPLE (ACCESSORIES)

RED (BATTERY POSITIVE)

I have since diagnosed the 3 pin connector is for the tach:

Purple=positive 12v
Black=ground
gray= send signal from engine