If you trust your other gauges....then that sounds about it...your covering all your bases. I run mechanical water temp and oil pressure, since the stock electrical gauges can be as much as 15 deg / psi off at times.
The only one left is the oil temp, and you might want to get a remote trans filter. They have a spot on them for a temp probe so it makes it easy, and it is much easier to change than the metal screen.