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Old 10-07-2018, 06:01   #1
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Join Date: Jan 2014
Location: Orlando
Boat: Hunter Passage 42
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Replace engine panel what type of tach


My ancient Yanmar engine panel is so sad. I was thinking of fixing some of the pieces but am thinking it may be better to just replace.

I found a company that makes a decent looking panel. They are 'acdcmarine' in Torrence Ca.

I'd like to have gauges which the new one has, and actually have a working tach. But the company has 3 options for the tach and I have no clue how to determine which one I need. Description States:
Please Note Which RPM pickup your engine has before purchase.

The Alternator Tach which is also called the variable ratio tachometer, is hooked up to the AC output terminal on the alternator. This terminal can be marked in a variety of different ways: AC, AUX., S, R, TACH, or nothing at all. Once installed, the tach is then calibrated to that specific engine by using a shop tach or a known “no load” governor speed. The white label on this tach gives the formula: [Crankshaft pulley dia./alternator pulley dia x NO. of Alt. Poles = N] “N” is used to determine the correct switch setting. Another adjustment on the back allows for fine tuning.

Please check the type of RPM signal your engine has, we have all three tachometers available for purchase

I recently replaced my alternator and there was a connector that I put a wire on, but not sure where it routed to. There is a sending unit on the flywheel. The engine is a Yanmar 3HM 35F. Attached pic is the panel I'm considering. Opinions and info much appreciated.
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Geek_Guy is offline   Reply With Quote
Old 10-07-2018, 06:18   #2
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Re: Replace engine panel what type of tach

Thanks for the post. I am planning the same project & parts this winter as I attempt to declutter & simplify my cockpit. I was unaware of the tach pick-up signal selection on the part. Following
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Old 12-07-2018, 06:05   #3
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Join Date: Jun 2017
Location: Kingston
Boat: Ontario 32
Posts: 76
Re: Replace engine panel what type of tach

I have an old smaller Yanmar. The tach pickup is not from the alternator. It is from a magnetic sensor that is in the flywheel housing. It gets a pulse each time a flywheel gear tooth goes by. If you follow the wiring from the panel tach you may find you have the same.

I replaced my tach with a universal model made by VDO. It has to be calibrated to match the number of teeth on the flywheel. Unfortunately, because we disconnect power during winter storage, this would have to be done every Spring. I just go with the default setting, know that the tach readout isn't quite right and live with it.

I guess going to an alternator type is an alternative. Somehow I thought that was mainly for gas engines. Also sounds like they need calibration.
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Old 13-08-2019, 08:12   #4
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Join Date: Aug 2019
Location: St. Croix USVI
Boat: Beneteau 323
Posts: 5
Re: Replace engine panel what type of tach


Looking at AC DC for a new Yanmar engine instrument panel. Any thoughts on AC DC? Did they deliver what they said they would deliver?

Sarah, sy Djarrka USVI
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Old 14-08-2019, 11:41   #5
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Join Date: Apr 2018
Location: Florida
Boat: Manta 42
Posts: 14
Re: Replace engine panel what type of tach

Several Manta owners (myself included) have purchased replacement panels from AC DC for our Volvo MD2030s and we've all been happy.
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