How do I hook up tweeters in my truck off of my stereo?

[L Bobo]

I have a massive subwoofer in my truck, have nice mid range speakers, now I need tweeters, I'm wondering how to properly hook these off of my Pioneer deck speaker outputs, preferably I would like to run it off of the front left and right speakers (but also keep the front speakers hooked up), but how do I get rid of all the low frequencies for just the tweeters? Getting another amp just for the tweeters is out of the question because of space issues, and the amp powering my sub is a momoblock class D amp and I need all of it's power for the sub. Thanks in advance!