Older BMWs have a fuel consumption gauge on the dash. Someone has already implemented a standalone boost gauge for this, however it should be a simple extension of VEMS to handle this gauge directly

A Canadian fellow developed his own circuitry to control the meter:

A thought about the scale of the econometer is that it goes from 0 to 30. That could mean these pressures:

Data from this forum thread:

0 = 0,00 V

10 = 0,58 V

20 = 1,10 V

30 = 1,58 V

To max out the needle you need 1.75 Volts to pass the max marking.

A really basic and not entirely useless feature. Could possibly be designed to ouput other things. Could need a table, or a good approximation algorithm.