Tachometer using alternator

[evlskiers]

Has anyone here tried using the signal post off of the back of their alternator to provide the input for an electronic tachometer? Or have used an alternator tach signal adapter like this from Autometer?


Both of my mechanical tach sender drives have failed on my 8v/71s so I'm looking for alternatives. Thanks!

 

[bigbill]

probably a lot easier to go back with what detroit diesel and hatteras did

 

[Briankinley2004]

Has anyone here tried using the signal post off of the back of their alternator to provide the input for an electronic tachometer? Or have used an alternator tach signal adapter like this from Autometer? View attachment 84386


Both of my mechanical tach sender drives have failed on my 8v/71s so I'm looking for alternatives. Thanks!

Did you check the little adapter in the back of the tach drive? Those are bad about breaking but easy to change out.

 

[Captain Ralph]

I just updated my 12s with an Aetna sender on my front pulley. I always wondered but my mechanical take off from the blower drive was off a bit.

8709: Magnetic Sensor Kit (for custom application on diesel engine without a tachometer drive)

On the bottom of this page;

Tachometer Accessories | Aetna Engineering

 

[evlskiers]

Did you check the little adapter in the back of the tach drive? Those are bad about breaking but easy to change out.

Yes, Thank you. The boat is new to me, one of the mechanical drives is bent and missing the sender and the other engine is missing the sender. Since I have to replace almost everything, I'm looking at all options.
Regards,
Mark

 

[evlskiers]

I just updated my 12s with an Aetna sender on my front pulley. I always wondered but my mechanical take off from the blower drive was off a bit.

8709: Magnetic Sensor Kit (for custom application on diesel engine without a tachometer drive)

On the bottom of this page;

Tachometer Accessories | Aetna Engineering

Thank you! This is what I was looking looking for as an alternative that others have used.
Much appreciated!
Mark