Quote:
Originally Posted by Lonely Sushi
Thanks for the pics.
The reason why I am insisting on trying to find the tach output instead of with the fuel injector / crank shaft sensor is the fear of interfering with the signal. Had experience before with an impreza build where customers use those signals and keeps burning out / screwing with the engine.
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There is no interference. Gauges don't send current, they read the input. You can't interfere with anything when there's nothing to interfere with.
As many vehicles as I've worked on, I have not experienced an issue where one tach connection was any better over another, aside from convenience of location, and especially nothing noting fuel injectors weren't a reliable source for a tach signal.
In fact, unless using a data module, most vehicles spec the uncommon color wire at the fuel injector to be used as the tach. At least in these vehicles, I don't have to go under the hood to get to it.