Problems swapping engines in the Hatchback (wrong topic)

so to very briefly explain my situation here, i was bored out of my mind and tought on how to fill my time with something interesting... yea why not swap the V6 Engine from the Pessima, that nobody really cares about, and put it into the hatch, looks cool sounds cool... sounds easy hm...

so basically i've putten the engine in the car via Blender, after fixing etc everything to place and using the .dae ingame the car started to look weird, the tach is completely butchered (pics explain it a bit better) and the stock steering wheel turns under the car... again hard to explain, also the mirrors have no texture now and the windshield's permanently cracked... and the reflection of the carbody is kinda weird...
oh yea and the padles are weird

alright, so here's some pictures Screenshot_10.pngScreenshot_11.pngScreenshot_12.png