problem with defi rpm gauge

[Ivan141]

You can build your own tach signal off of the coil- signal, but I suspect the DEFI gauge does that itself already.

Best way to do that would be to use an optocoupler with a pullup resistor to +12 and make whatever signal you want on the other side. This is a commonly used input circuit on megasquirt tach inputs.

What I would suggest though, is that you have a good look at your DEFI tach and make sure it is built/configured for 4 cylinder operation.
I very very much doubt it is reading the signal wrong, I just think it is expecting a 5th 'bang' for every rev, which would explain the 1.2 offset you are describing.

[fax0815]

Since I made a proper center console I had to take of the defis and the control unit. Unfortunatly I couldn´t get/ see the cylinder selection switches before.

As a few suggested, I´m stupid and can not set up a very basic controlunit, even with a printed manual.
I was on the 4 cylinder setting, but the wrong way around.
You need to have a good look inside the plasic housing, there are little white numbers printed on the switches. To set it up right you need to turn the unit upside down, which I just didn´t expect when I set it up the first time.

So yeah, nothing wrong with the dizzy signal, or the signal going to the tacho.

[Project D]

So now it work ?

[fax0815]

Yes!!!