problem with defi rpm gauge
05-04-2012, 08:19 AM
Post: #11
problem with defi rpm gauge
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.

FABRICA MI DIEM, PVNC!
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06-13-2012, 02:09 AM
Post: #12
problem with defi rpm gauge
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. Banging head Banging head Banging head
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.

1979 Toyota Corolla KE35
1983 Toyota Corolla AE86
1985 Toyota Corolla AE86
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06-13-2012, 02:56 AM
Post: #13
problem with defi rpm gauge
So now it work ?
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06-13-2012, 10:41 AM
Post: #14
problem with defi rpm gauge
Yes!!!

1979 Toyota Corolla KE35
1983 Toyota Corolla AE86
1985 Toyota Corolla AE86
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