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[MartinP]

Once again, for the kit car 

This is the drawing for the Tacho  :-?


How do I rig this up to the V6, to give me a reading? Where do I have to pick the feed up from?

The gauge supplier got a bit vauge when I told him there were 3 coils and said "I would rather you tell me how it is going to be connected"

Any help appreciated.

Martin

[Lazydocker]

Can't remember which V6 engine you're using but perhaps an injector feed as you're not having the ABS? :-/ :-/

I would think that either Kevin or 2woody will be the best bet

[MartinP]

Can't remember which V6 engine you're using but perhaps an injector feed as you're not having the ABS? :-/ :-/

I would think that either Kevin or 2woody will be the best bet

There only one V6  on here 

If I only get 1 coil input per revolution, presumably  the Tacho dip switches input the calculation factor to get the correct reading.

The wiring diagram I have put up is for the 100mm unit, I now have to go back as the 80mm unit did not show the selectable dip switches.

will try to get the other drawing up soon as.

Martin

[Marks DTM Calib]

Er, you cant easily.

The only possible might be to diode OR the three ignition coil feeds together and add a pull-up resistor.....got to be careful with back EMF though!

[Kevin Wood]

Looks like the same VDO one that I have.

If so, it'll work fine from the ECU tacho output signal that normally feeds the Omega dash (light green wire IIRC). It doesn't need to be fed from a coil. Select 6 cylinders on the dip switch.

Kevin

[MartinP]

Thanks both, I will try and find the output from the ECU then.

Martin

[Kevin Wood]

Pin 43 on the ECU (Green wire).

[MartinP]

Pin 43 on the ECU (Green wire).

Thanks Kevin, I spent 10 minutes looking at the drawing and couldn't see that for love nor money 

Does the output send a true pulse or a fraction?

The 100mm ETB clocks are cylinder selectable not sure about the 80mm.

Martin

[Martin_1962]

Pin 43 on the ECU (Green wire).

Thanks Kevin, I spent 10 minutes looking at the drawing and couldn't see that for love nor money 

Does the output send a true pulse or a fraction?

The 100mm ETB clocks are cylinder selectable not sure about the 80mm.

Martin

Green wire well know among LPG installs

[Kevin Wood]

Pin 43 on the ECU (Green wire).

Thanks Kevin, I spent 10 minutes looking at the drawing and couldn't see that for love nor money 

Does the output send a true pulse or a fraction?

The 100mm ETB clocks are cylinder selectable not sure about the 80mm.

Martin

It's one (12V IIRC) pulse per ignition event so configure the tacho for 6 cylinders and it should work.

Kevin

[Marks DTM Calib]

I thought the tacho was a multiple....maybe thats the speed signal then lol (which is why I didn't sudgest it)

[Kevin Wood]

I thought the tacho was a multiple....maybe thats the speed signal then lol (which is why I didn't sudgest it)

I think I scoped it when doing the first LPG conversion. The LPG ECUs seem happy with it at any rate.

Kevin

[MartinP]

Thanks for the info.

Spoke to ETB today, bloke was happier to know the signal was coming from the ECU.
He thinks the Vaux ECU will send a 12v square wave signal, so will configure the Tacho for a V6 and we will see how we go.

Will be calibrated at their works and can be changed if its not right.

I had terminated the Green wire as I thought I didn't need it. Extended it tonight to get it to the dash.

Martin