HELP needed with tacho

[MYT-16V]

Hi guys,

I'm running an older EMS in my 4AGTE, ae 86

Does anyone know how to wire up the stock tacho.

I know the EMS has a tacho output and some resistors are needed somewhere. But i have know idea where to start.

The engine is also running a crank angle sensor.

Thanks for any help in advance

[Hen may possibly be a nut]

http://www.google.dk/search?hl=da&rlz=1B3GGGL_daSE337SE337&q=%22tacho+tech%22+site%3Atoymods.org.au&aq=f&aqi=&aql=&oq=&gs_rfai=

[20v ae71]

- Multicoil equipped engine mating to a single coil dash
The tacho will be out by a factor equal to the number of coils if you only connect the signal from one coil. The signals from all the coils need to be combined and fed to the dash, as shown HERE http://img207.imageshack.us/img207/76/4coiltacho6jm.gif. That is for 4 coils, for any other number, just feed all the coil signals in from the left.

that image link wont work for me, anyone wanna quickly explain what i have to do? i have a CA18DET and wanna get the stock tacho working.

cheers

[20v ae71]

actually just realised it'd probably be easier for me to do this -
- New engine/ECU outputting 5V square wave mating to voltage spike tacho
Tacho wont work at all, or jump around randomly. You need to use a coil negative emulator or a tacho modification. The emulator converts the 5V square wave from your ECU into a series of voltage spikes. The circuit is HERE (http://img366.imageshack.us/img366/7362/coilnegemulator4ly.gif). This tends to give a somewhat sluggish needle though, maybe a bigger inductor would help. A .pdf guide for modifying the hardware in an AE86 dash to overcome this problem (and accept twin coils too) is provided HERE (http://www.rollamods.com/tech/ae86gzetacho.pdf)