Wild looking setup Ben! I just had a look at their website and see reference to upper and lower settable alarms. Is there the option for the gauge to change colour, or is the alarm always as a written indication (hi, lo, fail) ?
Products - VEI Systems
These gauges on a black dash would look very stealthy when the car is parked, but will light up like a space ship when you switch the key on! Can you control/dim the brightness?