65 Barracuda dim dash lights - no gas gauge either

unrelated issues. i changed out the bulbs. in the same physical size, there #158 (3.38 watts), #1445 (1.94w)
also shown LEDs HELLA 921LED5K LED Miniature Bulb 12V; 1W; and HELLA 921LED65K LED Miniature Bulb 12V; 10W;

LIghting is better, but not real bright. Will the 10 watt LEDs work if I just install them without any other changes?
5 times the light? will it work correctly with factory dimmer knob on switch? I thought LEDs and dimmers were problematic

gas gauge? still no work-ee.