1978 johnson 150 hp,trying to install a tach,will any tach work ?

by rick
(aztec,n.m.)

Johnson, v-6, 6-pole engine, it has a grey tach lead.we tried a sun model car tach ,set to 6 cyl. but it wont read. A test light hook to the lead an a ground lights.....is this system magneto capacitor discharge type? does it take a special tach ?

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