Hi everyone.

What thing must be change in tachometer to received the signal from subaru
engine EJ22.
it is something like that
http://www.smallcar.com/index.php?dispatch=products.view&product_id=29870
its inside tacho.

Adam

On Sun, 20 Sep 2009 23:38:19 +0200, "Adam Szewczak"
<horses@usuñ.poczta.onet.pl> wrote:

I'd guess they are adding an amplifier to the tach signal input. I had
to use a gas engine tack on a diesel once, and the diesel's tach
output was way too low. I used a simple IC OP amp, and one or two
other parts. Took about an hour to design and build.

Uzytkownik "PeterD" <peter2 (AT) hipson (DOT) net> napisal w wiadomosci
news:7f8db5p54gdj7h5vi1bcomesqpkumjdfav (AT) 4ax (DOT) com...
It must be something like that. I know only that signal from subaru ECU
is too week for VW tacho.

Adam

"Adam Szewczak" <horses@usuñ.poczta.onet.pl> schreef in bericht
news:h967bu$jva$1 (AT) news (DOT) onet.pl...
It's very simple. I guess the vanagon picks up the signal from the neg. side
of the coil(?) If so then all you have to do is follow the signal wire where
it connects on the small pcb. There's prob a resistor in line with this wire
which reduces the high voltage comming from the coil. You can by pass this
resistor with a low value resistor untill you get a reading. Start with 1k.
The subaru prob has a tach output pulse of 12V, measure this first.

I've done this mod on a golf II tach to read the 12v signal of the ford
edis system.

SFC