My mate has just fitted an autometer tachometer (rev counter) to his Fiesta Rs Turbo it is running Ofab management if that makes any difference and it is wired in as it says but it is only reading half what it should example it idles at 1000 rpm on the standard clocks and on the tacho it says 500 rpm does anyone know how to fix this???? any help much appreciated

 

bttt as im going home

 

I assume he is taking the feed from the Coil?

Try taking the feed straight from the ECU pin or from the feed to the existing Rev Counter.

Its to do with the Wasted Spark system AFAIK.

 

ok cheers mate ill try that

 

I htought when u order a tacho u had to specify about the wasted spark setup! as they do 2 different types of tacho!

 

normally theres just some wires on the back to configure it to your own car... ie 4 6 8 cyl wasted, nonwasted etc.

 

Steve,

I have added a Large Elliot tacho to my dash to my Fez, i just soldered the wires to the circuits on the back of the clock.

Think off ther top of my head there was 3 connections, ones a live, ones earth & the other was the feed................mine seems fine..Cant remember if i've got ofac or ofab now?? which one runs the MAP sensor??

 

i configured my stack for 2 cilinder application and it works fine on my OFAC fiesta.
connected it to EDIS pin 10.

If you set it as standard 4 cilinder you'll get half readings.

 

it is an autometer gauge and he bought it from ebay ill have to find out how he wired it up cheers

 

my mate reckons there isn't a wire for 2 cylinders on his is there any other way of getting round it?

 

There are 2 tiny loops of wires that poke out the back of the gauge and then you have to cut the according loop to what engine you have.
8 cyl = cut no wires,
6 cyl = cut brown wire loop,
4 cyl (2 pulse) = cut blue wire loop,
4 cyl (1 pulse and vr6) = cut brown and blue wire loops.

Cheers

Paul