Joshcar

So i recently ordered a dash kit and wiring harness online. The harness is
SCOSCHE TA02B Wiring Harness for 1987 and up Toyota. And it does not fit at all, i've tried and it doesn't fit into any of the oem harnesse's the smaller one's to loose and the bigger one is to tight and doesn't go in, also it seems like the connectors are different... If anyone knows of another harness that may fit it'd help a lot

Edit: I've been searching around and the reason it doesn't fit is because I have the Nakamichi sound system, i found some information of how to hardwire it, but not much. If anyone can help direct me to where to find some information it would be greatly appreciated.