A point to consider is engine data is something that's best kept visible all the time.
Being able to scan the gauges looking for outyling changes is key to catching problems before they get worse. Old-school analog needle style gauges on digital screens are great for this. You don't care that the reading is one number vs others, you only care that the needle is not where it's supposed to be when you're scanning the readings.|
The upside is the TZT3 are fast enough to pop back/forth between charts and other pages, whereas older series were way to slow to make it worthwhile. But I'd still want live temp, pressure and RPMs values in front of me at all times.
A second TZT3 would be great for this, but possibly overkill!