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Product # 9116

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Designed to help correct bouncy, or spiking tachometer operation caused by points or noisy ignitions.

Feature Points

  • Works with all AutoMeter and Autogage tachometers
  • Releives jumpy/erratic pointer conditions due to a noisy signal
TACHOMETER SIGNAL FILTER is rated 2.0 out of 5 by 1.
Rated 2 out of 5 by from Didn't work for me I was hoping it would solve my bouncing needle problem but it didn't. My configuration is - 59ab flathead engine, Pertronix ignition and coil, 12volt negative ground. I do thank Autometer technical support, they worked with me in trying to resolve the issue. Autometer tech support gets 5 stars but since the solution didn't work for me I gave the product 2 stars
Date published: 2019-08-07
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I have a bouncy needle at low rpm which clears up after driving a short distance. When I wire the filter in the tach does not work at all. I have tried to install the filter on 2 different engines with different coil types, same result. Any ideas?

Asked by: Doug B
Check your ground, the tach should have a separate ground preferably to the engine block NOT a chassis block ( everything in your vehicle is connected to the central chassis). When you connect to a common ground you can get erratic signals (RF) from various sources ie: radio, stereo speakers, alternator, wiper motors, heater/ ac motor and most common old spark plug wires and non supressor spark plugs. The filet can only so much RF ( that’s what it’s designed to do) but if incorrectly installed) you will get irractic RF. My advice-  change your ground to a single wire connected to the engine block and check/ change plugs and wires. Good luck
Answered by: Sarg
Date published: 2019-10-16

I have a 2015 lt direct port injection with a aftermarket push start and im having issues with the push start recognizing the signal. Im being told i have a dirty tac signal and that i need a filter. you think this will help clean that signal up?

Asked by: carlos
A filter could help, check your grounds, isolating aftermarket grounds will help a lot. Community grounds (chassis grounds build up RF interference) ground one or both to the engine block ie isolating the ground wires from the chassis. Hope this helps,  ps using filters always helps Getting rid of RF signal noise
Answered by: Sarg
Date published: 2019-08-06


Asked by: Gozer
Thank you for your question. This is just a filter. It will reduce noise or interference from certain ignitions. It will not make certain tachs compatible with systems that are not already compatible with.
Answered by: Zach from AutoMeter
Date published: 2019-06-13

Good afternoon. Do you know (or can you recommend one) if this will work on a 1992 corvette?

Asked by: Harry
The filter from auto meter will, but here are my recommendations- first and foremost isolate all wiring to the tach by seperate clean 12v power, do not use a chassis ground this is usually the biggest problem because all of you instruments lights fans ac etc are connected to a central ground all of these produce rf interference ground the tac directly to the engine block away from the distributer. If your tac is currently bouncing erratically RF is the problem. On your vett be sure to connect your signal wire up to your coil. Install suppression spark plugs, they will not affect engine performance but will reduce another source of RF. Now if you have modified you motor ie distrbutor fuel injection high output stereo. You might need to use RF coils in addition ( cheap, easy to slip over ground wires on grounds close to your tac. These are avaiible on ebay and amazon.  RF coils absorb random RF. This sould get you going in you nice vett.
Answered by: Sarg
Date published: 2019-06-08

Does this filter provide a “square wave” 0-5v signal suitable for electronic transmission signals?

Asked by: DBitt
Thank you for your question. This filter does not create any type of signal. It is installed inline and will clean up a "dirty" tach signal which may be produced by an older ignition.
Answered by: Zach from AutoMeter
Date published: 2019-03-21

I have a Bosch Sun Pro Tach that started fine and is now moved up to 3,000 rpm as it's base. Have a Petronics ignition (old school open roadster). A filter was suggested. would this work. Thank you

Asked by: Rick1948
When it comes to sensitive automotive electronic devices, they can be affected by sources of interference typically known as EMI and RFI “noise” which causes erratic operation. A marginal electrical ground connection only makes matters worse. Automotive manufacturers rely on unified ground connections directly to the chassis for all electronic and electrical components. A good solid ground for accessories to the engine block is fine but it’s absolutely imperative that a heavy gauge ground cable be installed between the engine block and the vehicles chassis.  A ground connection might look okay and feel tight but since all electrical connections rely on bare metal to metal contact, there can’t be any paint at the point of contact which could allow rust to form causing a high resistance or “floating” ground condition.  When used with a healthy tachometer and proper electrical connections, the AutoMeter Filter does an excellent job of removing electrical interference noise that gets induced into the electrical system. 
Answered by: AnalogDan
Date published: 2019-01-21

Will this work on my after market digital tach?

Asked by: jjkonye
I assume that you are experiencing needle bounce/ issues, yes it will work with any tac Be sure that your tac is grounded independently (attach your ground from the tac directly to the engine block. Do not ground to the chassis. (Everything else in your vehicle is chassis grounded and contributes to RF interference). RF is your major cause of tac problems if you haven’t changed spark plug wires you may need to change them to resistor wires as well, this is also another source of RF interferance.
Answered by: Sarg
Date published: 2018-09-24

Will auto meter 9116 work with GM hei and 1973 firebird oem dash tach. Currently tach read high

Asked by: Farmerick
Thank you so much for contacting us. Unfortunately our tach filter is designed to work with AutoMeter gauges. We haven't tested it with any other gauges so I'd be very hesitant to recommend it for use with your OEM tach. Typically this treats bounciness or erratic movements; it is not used for calibration issues which it seems like yours may be exhibiting. Sorry for the bad news.
Answered by: Joseph At AutoMeter
Date published: 2019-01-19
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