unfortunately no easy way, cant even enable it with forscan. the only way Ive seen adding a permanent gauge is to drill and tap the area right next to the low pressure switch on the engine block and add a mechanical gauge. I had to check my pressure with a gauge in place of the low pressure switch, once with used oil cold, used oil hot, fresh oil cold, fresh oil hot, fresh oil with lucas cold, fresh oil with lucas hot, up down up down up down, thankfully a friend had a lift and didnt mind the mess. there are some vital stats I wish I could monitor on the fly, boost, oil pressure, tempuratures for the drivetrain, forscan will read some but not all, from what I understand things like boost and oil pressure are not monitored by the car in any capacity, just a trigger switch that lets you know the oil pressure is below a threshold, I believe it was 7psi