Whattmeters & all the other gadgets are similar to living without a Smoke Detector.

Can you live without either one of them, with no problems ? ....Of course....Millions do everyday with no problems.

Is life less stressfull with both ? Of course.

If you want to change parts for more power, you will need more knowledge of what you have and what you will need to change for more intense flying.

Whichever you do is O K.

Rich