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Quick Specs


This compact and easy to install module will allow you to easily adapt AutoMeter tachometers and shift lights and many other aftermarket RPM-based devices on your alternator-equipped diesel or non-standard ignition gasoline engine. Equipped with a sensor which is mounted to the alternator casing, a one time setup calibration is accomplished via push button interface on the module to synchronize the alternator signal with engine crank RPM. Perfect for diesel performance applications looking to add a tachometer or upgrade from factory equipment and a great problem solver for engine swap builds in need of working instruments. Pair it with AutoMeter's low-rev tachometer models to complete your diesel-specific gauge installation.
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Rated 5 out of 5 by from Worked well. I hooked mine up to a 4bt and wired into the oem for ranger tachometer.
Date published: 2020-06-15
Rated 5 out of 5 by from Perfect kit I bought this item like a month ago, I’m very pleased easy to install fast shipping recommended
Date published: 2020-05-08
Rated 5 out of 5 by from Gréât equipement Just what i am looking to make my tach Working with an old alternator Good product thanks
Date published: 2019-11-12
Rated 4 out of 5 by from Sensor works fine, easy to install. Had to use a 1K pull up resistor for the adapter to work with a VDO tachometer gauge. A circuit diagram of the adapter o/p circuitry would have been helpful.
Date published: 2018-04-08
Rated 1 out of 5 by from Poor Sdvertising Company should tell you that it will only work with their tachometer,would not have purchased if i had known . too expensive for Australia
Date published: 2019-12-13
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Hello Pierre I have a 1984 w123 mercedes diesel 5 cylind without tacho just a clock is it possible to put your system with a classic alternator 1984 and a VDO mercedes tach i got recently from a 300d turbo D 1984

Asked by: pierre 300D
We do not have information about this product working on anything besides our electronic speedometers.
Answered by: Thomas From AutoMeter
Date published: 2022-04-01

Will this work the dual diesel alternator setup?

Asked by: Ericjo
We would like to know more information on what you are working on. We'd recommend reaching out to our Tech Team at to help you on this matter.
Answered by: Sarah from AutoMeter
Date published: 2021-11-03

Do you have to use one of your tachometers with this or can I use a different brand along with it.

Asked by: Anonymous
Thank you for contacting us. We can only guarantee functionality and provide if you use an AutoMeter tachometer. The 9112 creates a 0-12V square wave which should technically function with other aftermarket tachometers designed for standard/electronic ignitions.
Answered by: Sarah from AutoMeter
Date published: 2021-11-02

Will this diesel adapter work with AutoMeter Mini Tach part 2306? Thanks.

Asked by: MeteredAir
Thank you for contacting us. If you don’t own a tach yet, we’d actually recommend 2888 which is a small diesel tachometer and no separate adapter is required. However, the 9112 creates a standard tach signal, so it is compatible with the 2306.
Answered by: Sarah from AutoMeter
Date published: 2021-10-06

Does this output a signal that can be used by a dynamometer? I have an all mechanical diesel with no crank signal.

Asked by: The Driveway Engineer
Thank you for contacting us. The 9112 uses a pick-up that is specifically designed to mount to an alternator. That “raw” signal from the pick-up is then converted to a traditional 12V square wave tachometer signal within the module itself.
Answered by: Sarah from AutoMeter
Date published: 2021-09-10

Will this adapter still output a correct RPM when my battery is fully charged and the regulator has turned off all field current to the alternator?

Asked by: Mrcandy
Yes it will.
Answered by: Mrb5105
Date published: 2020-09-01

Hi. I've got a classic SMITH'S petrol/gas tachometer on my diesel Land Rover Defender. Will this device allow me to somehow get a reading from my diesel engine to my petrol/gas tachometer? Also, do you have a similar arrangement for a petrol/gas speedo?

Asked by: Musa
Hi, This adapter creates a standard tach signal: 12 volt square wave at 4 pulses per revolution. We don't have data as to what type of signal your Smiths tach requires, however. Thanks, Jim
Answered by: Jim from AutoMeter
Date published: 2020-05-12

Jim, I believe you misunderstood my question. Will this adapter work on a neese lavel alternator? My alternator has a large hot and ground and only one other wire that goes to the ammeter on the dashboard.

Asked by: Lenny still lost
Yes it will. I have a 1988 Ford E-350 with 7.3 diesel and it works perfectly.
Answered by: Tim Purdy
Date published: 2020-05-11
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