M800 Tacho output

[Daniel]

Hi

I am running a ls2 v8 with a M800 in a VS Commodore ute with the std dash.I want to get the std tacho working but
can not see why it wont work.
I am running the STD ls2 coils in wasted spark and engine goes well.I have wired the ing output #6
into the tach on the dash but i get nothing.
I have checked wiring and its all good.
This car used to run a holden 304 v8 with a std ignition system no worrys and it Tacho was hooked
up the - side on the coil and worked fine this way.

Is this something to do with the motec or do i need to add something to the wiring.

Thanks Daniel

[IJ.]

Tried using an AUX out in mode #4?

[Daniel]

No i havnt as yet, as i dont have any left but will try that tonight and see.

Thanks Daniel

[IJ.]

No i havnt as yet, as i dont have any left but will try that tonight and see.

Thanks Daniel

Can only use AUX 1>4 Dan.

[Daniel]

Thanks mate i will try in the morning and let you know.

Thanks Daniel

[IJ.]

I use it here to send the RPM signal to my Trans controller and have used it in the past to run factory Tach's before I got the SDL.

[Daniel]

Nope no good. Moved some things around so i could use AUX3 an its the same i have nothing.
Any ideas?

Daniel

[IJ.]

Currently I'm using Ign #6 in mode #4 to drive the tach in of my trans controller (LSx V8 in batch fire)

Not sure what signal the stock Tach is looking for though sorry.

[Daniel]

Well the way its set up normally is run just from the - neg side of the coil straight to tacho.

I tryed my dash in another car this afternoon and worked fine so i know
the dash tacho is fine.I checked the wiring in my car as well by hooking the -side coil wire from the other
car to my wiring in the dash and aswell my dash tacho worked fine.

So i am sure this is a motec output thing and would like to know more info as what i would
have to do to fix this. Do i have to put a pull up resistor to 12Volts on the line to work?

HELP

Daniel

[IJ.]

Not 100% sure but I thought the MoTeC Tach driver was a 5v square wave output (someone that knows might jump in to confirm)

I had an issue with a Toyota Tach some years ago and ended up taking it to an Instrument shop down here and they tweaked it up to work.