Sorry to bump an old post, but how did you go Oilad?
I just installed a Autometer Cobalt gauge, 1st & 2nd holds fine @ 20psi, however when I hit 3rd it goes off the gauge as well then drops back down.
Does anyone know if a 2013 navara is the same? Cut a tee piece in on the drivers side of intercooler? (Can't see on that side of intercooler without pulling the grill off)! Also where did you tee in to get your power from for the gauges? Thanks