Turbo Gauge not working?
 

Hey guys, okay so I just bought my new Toyota Supra Turbo and I have been around the scene awhile but my last car was an N/A so I am not sure if this is the norm for this turbo gauge. The needle doesn't seem to move until the turbo injects the air and even then it just basically jumps up and then almost immediatly falls back down.... but I thought the needle was supposed to show how many PSI is being built up as it goes, am I wrong?
Thank you

its a very inaccurate gauge, but it should it sholdnt drop off like that unless ur shifting or letting off the gas

its an old car and if it like any other mk3, it has had previous owners neglect it and now all those problems passed on to you. i see two options, 1. troubleshoot this current problem and fix it, or 2. get an aftermarket one. personally id get another one as ive been told these are inaccurate gauges, and they have such a small range on their scale.