Stock gauges and Holley EFI
Thread Starter
Joined: Mar 2010
Posts: 436
Likes: 41
From: Vancouver area, West coast Canada
Stock gauges and Holley EFI Been testing a module that takes the data from a Holley EFI ecu and converts it to GM data to run the stock dash Tach, Temp, Fuel gauges :
https://www.youtube.com/watch?v=KvDp...ature=youtu.be
https://www.youtube.com/watch?v=KvDp...ature=youtu.be
Last edited by gjestico; Sep 7, 2020 at 10:34 PM.
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Thread Starter
Joined: Mar 2010
Posts: 436
Likes: 41
From: Vancouver area, West coast Canada
Its a board with a custom programmed microcontroller that reads the holley data stream and converts it to GM Class 2 data that the instrument clusters reads.
If there is sufficient interest I may proceed with a production unit.
If there is sufficient interest I may proceed with a production unit.
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What's the guestimate on price?
I'm trying to decide between switching to a Terminator X system or just getting a stock PCM tuned, for a daily driver turbo z28. Biggest drawback so far on the Terminator X system is having to also purchase a display.
I'm trying to decide between switching to a Terminator X system or just getting a stock PCM tuned, for a daily driver turbo z28. Biggest drawback so far on the Terminator X system is having to also purchase a display.
if my guages all still worked I'd be interested in it
Thread Starter
Joined: Mar 2010
Posts: 436
Likes: 41
From: Vancouver area, West coast Canada
No, you dont need the factory PCM with this. This small module basically generates all the Class 2 data that the instrument cluster used to get from the original PCM.
So, The instrument cluster Tach, Temp and Fuel gauge run off this serial data. The Oil pressure gauge is "old style" and uses the one wire sender on the back of the engine. This remains the same with this data converter.The voltage gauge runs off the cluster power feed so it remains unaffected.
The speedo runs off a square wave frequency type signal that is on a dedicated wire from the original PCM. Depending on whether you have a manual or auto setup will determine how to get that signal back to the speedo. If you are running the trans thru a Holley Max for example, then that vss signal could be available on the holley data stream, and thus this module could be evolved to include speedo functionality as well.
So, The instrument cluster Tach, Temp and Fuel gauge run off this serial data. The Oil pressure gauge is "old style" and uses the one wire sender on the back of the engine. This remains the same with this data converter.The voltage gauge runs off the cluster power feed so it remains unaffected.
The speedo runs off a square wave frequency type signal that is on a dedicated wire from the original PCM. Depending on whether you have a manual or auto setup will determine how to get that signal back to the speedo. If you are running the trans thru a Holley Max for example, then that vss signal could be available on the holley data stream, and thus this module could be evolved to include speedo functionality as well.
Ok. My car was a 6spd car, I now have a 4l80 with manual valve body. So this seems simple enough.
would use all holley harness but it connects to this module it seems.
this seems to be my best option. My car is a lower mileage car so I hate to pull my factory cluster or disable it.
I can use the 3.5" screen that you get for adjustment or I can use my laptop for changes.
would use all holley harness but it connects to this module it seems.
this seems to be my best option. My car is a lower mileage car so I hate to pull my factory cluster or disable it.
I can use the 3.5" screen that you get for adjustment or I can use my laptop for changes.
4l80 has a vss on it to get signal to stock ecm,I hope the x or x max does as well.
I also have to "pass" emissions , really just plug in and see no codes set.
probably still need to be able to piggyback?
TECH Apprentice
Joined: Apr 2016
Posts: 313
Likes: 16
From: Lincoln, NE
Been testing a module that takes the data from a Holley EFI ecu and converts it to GM data to run the stock dash Tach, Temp, Fuel gauges :
https://www.youtube.com/watch?v=KvDp...ature=youtu.be
https://youtu.be/KvDp9bgVlls
https://www.youtube.com/watch?v=KvDp...ature=youtu.be
https://youtu.be/KvDp9bgVlls
Very cool, thanks for sharing.
I would be interested in this! Jolt Systems makes a plug and play harness to use the Terminator X and have the stock gauges work but it would require the stock PCM also. This sounds like a better option. How much would this be?
I seen the jolt harness. Would that be needed still if emission testing is required for obd2 port?
I assume you would have to do something LIKE the jolt harness (retaining factory PCM) because you would need the OBD2 to pass inspection. Someone correct me if im wrong.