didnt know a control box is needed too, if this is the case then think you are 100% right not worth it for a bit of flash gizmo. Ill ask lloyd as think he has had one fitted and will report back later today, to see if worth going through or not
Things may have changed since I saw this guys Defi unit, but my mate wanted on at the time and the HU display is just that, it takes data from the control box and shows it on the screen. Its the control box that does all the work of reading pressures, temps etc. I'll bang my mate an email, and a search on the MLR