Tacho driver wiring diagram

[e635815]

Guys,
Trying to get my head around the Megajolt wiring....
I have the tacho driver which takes the four coils feed and produces a single signal.
I guess this output should be wired to the ECU pin 1 and tacho line (normally connected to -Ve)
But what shall I do with the resistors on the ECU line?
Are they still needed?
Thanks

[e635815]

Yes you're right. The resistor is here to protect the ECU.
If I add the tacho driver to the resistor, will that not be too much a reduction in the voltage drop going to the ECU and tacho?
I just can't seem to find a valid answer to that question.....

And the coil packs are not better in terms of voltage spike, are they?

[e635815]

So, if I understand correctly, the four into two into one connects with the -Ve for each coil and the single wire then goes to the ECU and Tacho connection.

On my loom I have two thermistors, one for the ECU and one for the tacho.
Instead of tracing each wire to its source, is there a way to know where goes which wire?

[e635815]

Forget stupid question....
When the engine runs, unplug one wire.
If the tacho stops, then this is the tacho line and if the engine stops, then....

[e635815]

No, not so stupid question.
It appears that the resistor on the line might be too high when coupled with the tacho driver.
The voltage pulse might not be high enough in order to trigger the ECU.
What would you recon?
Remove the resistors altogether or what?