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The sensor is a magnet so it works as an inductive pickup. My TD42T reads approx. 1v AC on idle and increases with speed.
The tacho is a type of voltmeter so reads accordingly.
The non Ti cam gear has holes so the metal between the holes provokes the signal. I don't know why they used dimples on the Ti. Also don't know what signal it puts out but I suspect it needs to be a bit more precise for the ECU.
My original signal was from the toothed gear of the IP but it ran through the EGR electronics that were used on the Safari.
I wasn't able to use it with my TB45 tacho so I had to mount the normal sensor on the timing cover and use a Dakota Digital tacho interface.
John
2001 GUII TI 4500 - Now converted to TD42T auto with Nomad valve body
That only covers the mechanical pump TD42. I don't know if the TD42Ti with electronic timing control and the dimples on the cam gear puts out the same signal. I've read several conversion threads where they haven't been able to get the tacho working with the Ti signal.
It also doesn't cover the TD42T mechanical pump with EGR which reads off the IP gear
@AB what tacho do you have working with the spacer under the sensor on the dimpled gear?
John
2001 GUII TI 4500 - Now converted to TD42T auto with Nomad valve body
That only covers the mechanical pump TD42. I don't know if the TD42Ti with electronic timing control and the dimples on the cam gear puts out the same signal. I've read several conversion threads where they haven't been able to get the tacho working with the Ti signal. It also doesn't cover the TD42T mechanical pump with EGR which reads off the IP gear @AB what tacho do you have working with the spacer under the sensor on the dimpled gear?
The original 1990 td42 GQ one mate. It works fine but doesn't read below 900rpm.
That only covers the mechanical pump TD42. I don't know if the TD42Ti with electronic timing control and the dimples on the cam gear puts out the same signal. I've read several conversion threads where they haven't been able to get the tacho working with the Ti signal.
It also doesn't cover the TD42T mechanical pump with EGR which reads off the IP gear
@AB what tacho do you have working with the spacer under the sensor on the dimpled gear?
I'm still looking for more info to post, but the signals whether ac or dc will increase with engine speed. I have seen a post elsewhere, that a bloke used a resistor to "pull up" the output signal so the original Tacho works. Also bypassing the ECU has been tried successfully.
Last edited by mudnut; 25th November 2016 at 09:53 PM.