TOPIC: Will OMC tach work On Merc Tower of Power

Will OMC tach work On Merc Tower of Power 15 years 1 month ago #16023

bobo Topic Author Offline Gold Boarder Posts: 549 Karma: 22 Thank you received: 0	I need a Tach on My 115 6 Cyl ..I have a OMC tach off of a 115 V4 .The V4 was a 1980 . My Merc is a Blue Stripe Im thinking 84 ..Can it be hooked up to the Mercury and work accuratly ?? Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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Re:Will OMC tach work On Merc Tower of Power 15 years 1 month ago #16025

MarkS Offline Moderator Posts: 5348 Karma: 118 Thank you received: 5	It might, depends on how the tach gets it's signal. If it's one that reads pulses from the "alternator" (12 pole) it should work. What brand/model is it? Does it have any settings on the back? Pics? Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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Re:Will OMC tach work On Merc Tower of Power 15 years 1 month ago #16043

Ferguson_Poole
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Hi,
To agree with Mark, yes a 1980 OMC V4 tachometer would read the alternator. The "blue stripe" Mercury started in 1972. Although the OMC tachometer will not work with the 1972-early 1979 Mercury ignition system, the tachometer sender wire (under the motor cowling) can simply be moved to connect at the rectifier. You should not assume, but Mercury did just that on the assembly line starting with the 1975 year model. So, you may not need to make any changes for correct operation.

Regards,
Joe
www.fergusonpoolemarine.com