I want to buy this a-pillar gauge pod from zzp

ZZPerformance - 3 Pod A Pillar Gauge Holder 04+ GP Gen 2 #ZZ-3POD-04-GN2

it seems like its good quality.

i am somewhat unsure of which gauges to buy though. Im not supercharged so no boost unfortunately lol (someday it will be). I'm leaning towards Vacuum because it seems really easy to install and it seems like a cool one to have to me, Transmission Fluid Temp because I will be installing a thrasher shift kit in my car and i figure while my dad and i are doing that we good do the install for that gauge easier, and then I am leaning towards Oil Pressure for the third. But I am unsure of how easy/difficult it would be to install. Has anyone done that before? And these are the gauges I am looking at. I have a limited budget so they probably arent the best, but do they seem good?...

Black 7 Color Oil Pressure Gauge

Black 7 Color Transmission Temperature Gauge

Black 7 Color Vacuum Gauge


If the install for these is looking difficult i might pass on it for now and get these tail lights instead (its my bday in a week so im trying to figure out what i want haha). any input on these tail lights?...

CG® 03-PP04TLEDSM - Pontiac Grand Prix 2004-2007 Smoke LED Tail Lights

thanks for your input guys