So just to update everyone. Turned out that the voltage drop across the dash cluster and tacho needle moving when applying the handbrake and power button (auto) was......DIRTY PLUG CONTACTS on the PCB 🤦🏼*♂️ Quick gentle scrape of every fucking plug contact. Plugged back in. Works perfectly. Just thought I’d let you know as i totally looked past the simple fix first 😂🤷🏼*♂️
