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Evolution55

Tacho feed

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Hi there I am currently in the process of fitting a G4 EVO 1-3 plug and play ecu. We have an expansion loom fitted and are fitting additional sensors etc and have changed ignition from wasted spark to sequential as i am running coil on plug. The issue we have is having a tacho output so the factory tacho works as it would get its feed off the stock ignitor, but we dont have any outputs/inputs left other than ecu hold power. Will it cause an issue using this output? Or is there another way?

 

Cheers

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The hold power will have additional circuitry which will cause issues when trying to use a tacho.

Also the tacho I suspect will be looking for a high level signal (coil negative type) so the ECU wouldn't drive with out it being modified. 

 

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I have an Evo 2 that I have converted to coil on plug, and the tacho dont need high level signal. It will work with an aux-output setup as Tacho like most "newer" cars do. The plugin ecu should already have a tacho output taken care of. I assume you are using the plugin ecu for an Evo 1-3 vehicle?

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