With your wiring tidy up in the engine bay did you keep the earths from the ECU separated as per factory and to separate locations on the block? If you join noisy earths (O2 heaters, ignition module, alternator…) with sensor earths (MAP, TPS….) to the same earth location you can have problems. They ...

It sounds like you’ve done everything on the car side. Two issues I’ve had 1. Charging laptop of a cigarette lighter in the car and trying to log at the same time, think I get some form of ground loop 2. Try a good quality USB lead with a ferrite bead, cheap USB leads have caused me no end of problems

Not that I understand the coding thought I’d throw it into ChatGPT and ask to convert the first one from C to M68K and it spat out the following: MOVE.W #0xFFFF, A0 ; Load the base address of HARDWARE_IO into A0 MOVE.W #0xE2FA, D0 ; Load the offset of HARDWARE_IO into D0 ADD.L A0, D0 ; Add the offse...

I’ve used SavvyCAN and found is quite useful for most things.
https://www.savvycan.com/

The dbc format was developed by Vector and the CANdb++ is great if you can get a copy.
https://www.vector.com/int/en/products/ ... are/candb/#

For fuel VY cluster is hardwired to the sender.
VZ gets fuel gauge info from the ECU which I imagine will go through the PIM and be converted to ALDL for the cluster.

Glenn and myself are at it again doing the Shitbox Rally in March which is a fundraiser for Cancer Council :D Australia. Anyone wanting to donate to this worthy cause can support our fundraising effort via the link below. Money raised is going to a worthy cause that I think all people have been affe...

Which ECU and code base are you using?

That could explain some of it, different tank in a Ute to sedan/wagon.
Although would have expected it be be just inaccurate rather than working sometimes and not others.

There was a change around this time to reverse the fuel sender resistance so dash may not match the calibration. Biggest change from VY to VZ was that in VY was wire direct from fuel sender to the dash. For VZ it was changed from sender to ecu that then sent information to the dash. I doubt there wo...

Yes, most likely need to reprogram the bin. I imagine it has all the codes for a 4L60E disabled to run the trimatic so I’d not running any of the 4L60E code and no trouble code’s showing as they have all been disabled. Do a compare with a stock 11P tune and turn back on all the transmission paramete...