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Quick Specs


If you’ve tried to get your tach to function after an LS swap, you know that it isn’t always a simple procedure. Save time, frustration and don't make a single cut in your factory wiring with AutoMeter’s Plug and Play LS Tach Harness. This Plug and Play solution lets you quickly and easily install the AutoMeter 9117 Tach Adapter onto your LS-derived engine. OEM spec connectors and wiring assure a hassle free installation that takes minutes rather than hours. No splicing, cutting or risks of voiding your vehicle's warranty. It’s completely reversible and couldn’t be easier. Get the best possible results in the least amount of time with the solution guaranteed to work right, the first time.
Feature Points
  • Includes AutoMeter 9117 tach adapter
  • The complete plug and play solution
  • Does not alter factory wiring
  • Plugs into factory ignition coil connectors
  • Sealed connector plug in to AutoMeter 9117 Tach Adapter
California Residents: Prop 65 WARNING prop65 Cancer, Birth Defects and Reproductive Harm


Rated 5 out of 5 by from Tach signal adapter As with most swaps that I have been involved with, the tach signal from the computer is corrupt and the signal is lost, with the plug and play set up that I ordered is the greatest thing (NO CUTTING AND SPICING) just unplug the coil pack for each bank and plug in the adapter harness and mounted the adapter on the firewall and run the tach wire to the tach,little square box on upper pass side firewall look close to see
Date published: 2018-06-18
Rated 5 out of 5 by from Super simple Exactly how it is advertised. Comes with everything. Plug and play all I had to do is solder one wire for my power safe nitrous gauge so it could read rpm for the widow switch feature. Also customer support was 10/10 straight to the point and knew exactly what I needed to get my system working and if anything else I had would interfere with it.
Date published: 2019-11-29
Rated 1 out of 5 by from #9123 didn't work for me I purchase a #9123 harness and adaptor to power my #2300 tech on a LS3 swap. It didn't help and I weasted a lot of money on it. It looked very impressive. A very easy harness to install.
Date published: 2019-07-26
Rated 5 out of 5 by from LS Tach Signal Adapter I reviewed the data involving clean LS1 ecm tach signals. The resistor fixes are a carnival of tricks that will burn more of your nerves than pulling that $170 from your wallet.
Date published: 2020-04-12
Rated 5 out of 5 by from Works perfect for gen 4 LS conversions Great conversion help for hen 4 LS engine when using older style tachometers
Date published: 2020-09-07
Rated 5 out of 5 by from Easy fix It is very easy to install and worked with no changes needed on the gauge.
Date published: 2020-03-01
Rated 5 out of 5 by from Tach Easy to install. Nice simple connections. Works perfect
Date published: 2020-07-18
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i have the American Muscle 5" tach. Do I need the 9123 with a 2005 LS2 out of a 2005 Corvette. Original harness.

Asked by: DennisV
If you could, send our tech team an email at
Answered by: Thomas From AutoMeter
Date published: 2022-04-26

Do all LS engines need the 9123 signal adapter to use your tach ?? I have an Ls2 from a 2005 corvette.

Asked by: DennisV
Typically our 9117/9123 would be needed for such distributor less ignitions like an LS Motor to produce a tach signal for our tachometers. If you take a look at 5284, it would have an instructions manual for LS Motors with more information on incorporating a 10k Watt Resistor, and if necessary, the 9117.
Answered by: Thomas From AutoMeter
Date published: 2022-04-26

Will this work on a x100 tach (hood tach on a 67 GTO) ? This car doesn't have the normal x1000 tach like most vehicles do.

Asked by: GTohhhh
Thank you for your question. This will not be compatible.
Answered by: Natalia from AutoMeter
Date published: 2020-12-11

I own a holden ssv commodore with the L98 engine wanting to know if this would work upon installing the pro comp2 monster tacho?

Asked by: MR L98
if you still have the coils mounted in original position it will work,you'll probably need to install the resistor that comes with it
Answered by: Autobahn444
Date published: 2020-06-16

LS2 to hz GTS dash ?

Asked by: Bert2277
Worked no issues was easy to install
Answered by: Case
Date published: 2020-05-20

Hi I’m run a GlowShift tachometer on my Ls1 swap I need to us tach adapter 9117 or just the plug and play harness 

Asked by: Spankyz28
the adaptor you need the harness,you WILL want, cutting and splicing the car's engine harness is a royal pain
Answered by: Autobahn444
Date published: 2020-01-14

Will this adaptor work on a 4.3 LV3 engine 2015 model GEN 5 with a stand alone harness 

Asked by: Kent519
Thank you for your question. This adapter is made specifically to be plug and play with LS engines. We have never tested it with your application so we cannot confirm compatibility. I would recommend instead getting the 9117 tach adapter that does not include the plug and play harness as it will be compatible on this setup.
Answered by: Zach from AutoMeter
Date published: 2019-12-03

Will this also work with VI Gen LT engines? I have a 2018 LT1

Asked by: Dcm_85
they work off your coil coil harness,may have to use a resistor and yes it will
Answered by: Autobahn444
Date published: 2019-11-29
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