Ya I was thinking about using those but... I would have NO idea what to look for when viewing those.
Engine temp should hover around 190, this way you can instantly tell if the engine starts to get hot. The analog gauge can be a bit misleading. This is also good for cold days. You can keep a closer eye on the temp to make sure you don't work the engine too hard if it is not up to operating temps yet. I usually try and keep my engine under 2000 rpm until the engine has gotten past 150*. Just personal preference.
Transmission temp, not sure what the FJ runs at but my 100 runs around 140-150. Something to keep an eye on mainly when towing.
Battery voltage should be around 13.6-13.8 or so when running.
Intake temp will be near ambient temp while cruising at speed. Significantly warmer during traffic/slow moving.