I will prob just grab a autometer my buddy has a couple from cars he has bought an ----. Want to go as cheap as possible

Forum classifieds are the only place to buy gauges. A lot of mechanical boost gauges I've seen (even brand new) are inaccurate to some degree. A decent ECU and some datalogging with a MAP sensor to figure out just how "off" your gauge might be is practically mandatory no matter how much money you spend.
I've had a Stewart Warner and 2 Autometers that showed up to 3psi off towards the edges of the range of the gauge... but I new exactly how far they were off.

I just kinda want to keep an eye on it to make sure I'm not spiking or something

Dealextreme has some cheap tight jdm blacked out defi wannabe electronic ones

DealExtreme: $24.43 60mm Boost Gauge (-1~2 Bar/DC 12V)

DealExtreme: $26.47 60mm Oil Pressure Gauge with Sender (0~7kg/cm2 DC 12V)

I saw them at hf last time I was there $20.

Just checked hf again no gauges

Those on deals look cheap as ----

Went to I reillys today and they actually have boost gauges for 24.99. So when I actually decide to buy one and stop buming one that's where I will go