normally i would just go with the Uego but i dont have anywhere to put another gauge in my car and i dont want to start adding gauge pods or getting into anything else fancy.
Is your issue just not a place to put the gauge bing, sounds like you jsut need a temp setup to tune.
The tuner usually has protable probes they use. Find out from them maybe?
AEM sells a gauges-less wideband that you can wire into your EMS and datalog while tuning. Also the EMS will use the wideband sensor as an O2 input and can correct if the AFR’s are out of whack…not so sure about PFC but most Standalone EMS’s can do that.
Dan has 2 AEM widebands in his S14 without gauges wired into the Vipec V88.
u dont need a wideband to tune, not if your dyno tuning. they stick something in ur exhaust like siliva_drift said. But it would help for street tuning and just for peace of mind