I am not an off-road guy, but I drove a stick and towed heavy stuff forever. You don’t need the tach if you have experience or ears. If you can’t drive manual without a tach, you’re a shit driver frankly.
The only reason I’ve ever used a tach is for break-in on a vehicle or for hypermiling.
Edit: before I went electric in 2017 and haven’t looked back :)
Oh yeah it’s worth having a tachometer, but I don’t know why you want one that takes up as much space as the speedometer on the gauge cluster. It seems gratuitous to me.