Mpvi3 and wideband gauge help please

New to tuning, but watching every video I can find.
I have an 85 fiero with a 3800sc from a 2002 grand Prix GTP. ECU from the same GTP.
I am looking to purchase a wideband for obvious reasons. I have the MPVi3 and am wondering how to hookup the wideband so the MPVi3 will read it properly. I am not familiar with CAN bus and serial, so this is where I'm looking for help. Do I need to use the prolink cable, or can I wire through the obd port and use the AEM gauge that uses the obd2 plug? If not, what is the best way to hookup the gauge for monitoring with the MPVi3? Thanks in advance!