Dashboard PCB Replacement (CJH Design)

[The Hairy Camper]

Some good news today, I managed to source a Diesel tachometer from a Jetta. Had some time to fiddle and test it with the latest PCB prototype this week and although it's not a perfect fit, it works!

I may have a go at swapping over the PCB from the Jetta tachometer into the T3 tachometer I have. If it works I should have a functioning factory tachometer on my T3.

[Aidan]

hence no temp gauge
Still looks like a good option for the fix

[The Hairy Camper]

Temp and fuel gauge are there (and functioning!), but are not much good as they are hidden behind the Jetta RPM plate

A win is a win though!

[The Hairy Camper]

I made some more progress this week. The factory petrol tachometer has now been converted to work with my diesel van. The red line is different, but the revs seem to match my aftermarket tach very closely.





Also, I felt bad about taking apart my Jetta tachometer, so I decided to try out these tachometer PCB's I had made. Turns out they work! I've also figured out how to bench test them with a signal generator now too, which makes calibrating them much easier.





I still have some more ideas/changes I would like to make, but I'm pretty happy with the progress.

[JeffRoo]

If of interest I have found the booklet that came with the CJH design I bought a few years back. I could scan it and send. Not sure of CJH IP though.
Anyway, the offers there if needed.

[TwinTurbo]

is it different to the already posted info?

[JeffRoo]

Good catch, no it’s not. It’s the same as the pdf

[The Hairy Camper]

Some more updates.

A new connection for aftermarket tachometers has been included on the Dashboard PCB. Much easier to connect now and no need to tamper with old wiring.

The combined tachometer PCB had some connection issues working with the temperature and fuel gauge. This got upgraded and is working much better now.

Oh, and I decided to see how purple looked for the PCB's



Original and aftermarket Tachometers working simultaneously. Unnecessary, but looked very interesting to watch.




The work continues.

Cheers

[TwinTurbo]

I colour code my pcb's based on lifecycle. Although I can't remember the sequence it's on my office monitor. Never use white as it screws with the silk screen and capacitors end up inverted.