The title says it all. I'm puzzled if there is a technical (Hardware/Software) reason behind the weird mixture of metric (Celsius for temperature) and non metric (like psi for pressure) in the Aston Martin Lagonda Series II (and later) dashboard.
This is especially noteworthy as distance and speed measurement can be adjusted between metric and imperial, while others can't. Also, with the Series III vector screens labelling wasn't an issue anymore, but despite the throughout redesign, the limitations where kept.
Since assumptions did come up, about it 'just' being some display, The whole car electronics are computer controlled. It's not like some (later) manufacturers adding superfluous systems complementing the workings, here everything runs thru the system (much like today). Every switch and every light. The only non-computer device was an additional mechanical odometer beside the engine for legal reasons.
The system itself being a discrete National Semiconductor PACE, an early 16 bit system