Progress Thread Electrical Help

Hi my name is johnny and currently im driving my 11th stang its a 96 gt with an 02 motor which is the same 2v basically . I swapped a 5 speed tremec into it with stage clutch ofcourse with 3.73 rear ,and long tube headers which excuse my language was a ****. Currently I am dealing with some weird electrical issues where the lights get brighter when the rpm's go up and when I put the car in reverse sometimes my radio will shut of and come right back on hell sometimes the light on the gauges will shut al the way off also my driver front signal keeps blowing and I replaced the flasher twice weirdest thing I think my pony is possessed
sorry about the progress prefix im new at this

would the switch make the bulb go out and make the green arrow blink fast and at some instances disappear ?

ohh yes I hear you on that ive pretty much rebuilt this car just about from replacing broken parts with upgrades lol is there a way to test the switch ?