Tweeter issue

I have a question about tweeters. I'm new to all this and dont have alot of funds. I drive a 04 Ford Crown Vic P71. I put a Kenwood DDX376BT head unit in. I put my old MTX 12 inch Terminators with the MTX 800w amp to power them. I have a Cerwin Vega 4 channel amp that isnt hooked up yet that I want to use to power the four 6x8 infinity R series speakers. They match the RMS of the amp. I also have a 2.5 Fared cap as well. My question is: I would like to add 2 kicker tweeters 75w RMS to my system. Would I need another 2 channel amp or is there another RIGHT way to do this? Please help. And thank you fpr your time.