Extra gauge to add to pod? Mildly modded '98 GST

[89_Colt_GT]

What I Have: '98 Eclipse GST, 6-bolt, Stock boost, T25, 90 OFH.
What I do: Daily Drive, Spirited Freeway
My Issue: I just bought a 2-hole gauge pod and boost is my only aftermarket gauge
My Question:Which gauge should I run in the spare spot and why?

So, I'm not gonna run more than stock boost. I have a boost gauge hooked up. All my dash gauges are functional and never fluctuate outrageously (could be a good or bad sign).

I believe the 90 OFH has an extra port for oil pressure/temp. Would an oil temp gauge be worth the $50 investment or would I be better off putting a different gauge in there.

My 2nd choice was a AEM wideband, however I can't justify $160 on a gauge that just looks pretty.

I'm tempted as a joke, to just run a clock lol