GQ TD42 using standard ignition-type tacho

[spektrum]

Hi all .. I have seen a few people asking about how to connect a tacho to their diesel, so I thought I'd share my experiences after doing a TD42 diesel conversion on my GQ.

The tacho pickup on my new engine is at the front of the engine. Im assuming its a magnetic pickup - not 100% sure yet. Some other variants have a pickup from the alternator (W-terminal) which is just a tap into one of the three phases.

I found following product online for around $70+postage. Also available on ebay. It can convert either of the above, and output to a standard ignition type Tacho.

Dakota Digital DSL-1 Adaptor

Will post more when I install it....

[MudRunnerTD]

G'day Spektrum,

Interesting post, i look forward to your further info mate.

Please go over to the intro section bud and post up an introduction. We'd appreciate it if you could say G'day before posting further. Not a big deal but it'd be great if you told us a bit about yourself, your car and where your from.

Cheers MR

[NissanGQ4.2]

Thanks for the intro Luke, have opened this thread back up

Cheers

Todd

[spektrum]

Cheers ... I hope to receive the adapter this week. Will be good to have the tacho working again!

[97_gq_lwb]

I am going to try this

http://sites.google.com/site/rd28eng...the-tachometer

http://www.ebay.com.au/itm/chevrolet...item27c7556a1f

[spektrum]

I am going to try this
http://sites.google.com/site/rd28eng...the-tachometer
http://www.ebay.com.au/itm/chevrolet...item27c7556a1f

I think you may find there is an issue with the frequency. I have been told the TD42 sensor is 18Hz/revolution. The standard GQ ignition tach is expecting 3Hz/revolution. Therefore you will need a frequency divider to correct for this.

I hope to soon receive the adapter that I ordered. It has a configurable frequency conversion.

[97_gq_lwb]

Have to wait and see My cluster is from the rd28 diesel gq originally and it went through the glow controller to change the tacho signal and it worked but i drowned my glow controller and decided to remove it altogether and either fit the td42 controller or a switch.
Is your cluster a td42 series 2 type i'd be interested in pics of the back of it or resistor values as they have a few options by the look of it.

[spektrum]

Have to wait and see My cluster is from the rd28 diesel gq originally and it went through the glow controller to change the tacho signal and it worked but i drowned my glow controller and decided to remove it altogether and either fit the td42 controller or a switch.
Is your cluster a td42 series 2 type i'd be interested in pics of the back of it or resistor values as they have a few options by the look of it.

Its a TB42 cluster. I recently did a TD42 conversion, therefore the reason for the tach conversion. It's been a big job...

[97_gq_lwb]

Ok be interesting to see if the tb cluster used the resistors and diodes in the back and what values if they did .
Theirs a pic of my cluster in this thread
http://www.nissanpatrol.com.au/forum...040#post232040

[spektrum]

Ill see if I can get some time to check next week. Going by that photo, looks like there is 2 resistors and a zener diode. You would also need to cut the track that is currently shorting across the missing resistors. Do you have a schematic diagram? Do you know what these components are connected to? I would think they tie in with another circuit such as the tach circuit in the glow control unit.

Ok be interesting to see if the tb cluster used the resistors and diodes in the back and what values if they did .
Theirs a pic of my cluster in this thread
http://www.nissanpatrol.com.au/forum...040#post232040