rusefi.com

Hello guys
So as documentation and also to get some help setting up the tachometer signal, could we have a brief explanation what the variables are for?

In my case i want to drive a oem honda 92 tachometer.
Thanks

I have a similar problem, I have a '97 Toyota Camry. It worked fine with a pulsed 12v output from my Microsquirt.

As far as I can tell, there isn't a 12v pulsed output to use on the UAEFI. It was suggested to use a ignition output for the tach, and... it sorta works for ~1 second when I first start the car. Then the needle falls to 0rpm and stay there regardless of revving it.

I've read elsewhere that I can use a injector output with a pull-up resistor to 12v. I'm not sure where to pull 12v from, or what value resistor to use. The documentation has zero information on tach output wiring.

there is "prototyping are" in the middle of uaEFI but does not look like it has +12v

power supply area has a couple of vias with +12v.

What pull-up resistance would be okay to use on a injector output? I assume a 10k resistor would be fine. 4.7k if the 10k doesn't work? I assume this would function as "default inverted" but am having a hard time understanding that as well.