Depends on how your gonna do it, but on our tractors where there is no room to mount in the dash and there is no time to be looking at it while going down the track, I mount the gauge under the dash or hood.
I buy those little 1.5 or 2” tire gauges with the pressure check valve, take the end cap off and solder a compression fitting to the back of it. Run your copper line to it, and you have yourself $10 a peak recall boost/drive pressure gauge.
They work really well honestly, I just coil copper line for the drive pressure before the gauge. If it was a daily driver a soot trap would probably be better