speedfreak90

i have a 90 s13 with a sohc ka. every time i full throttle in 3rd gear it feels like it hits a brick wall at like 5k and and is unaffected by ny change. now the previous owner put a s14 transmission in it, the speed sensor is hooked up but the speedo doesn't work. the sensors on the side of the trans are not hooked up. i know there is another post up on this but it didn't go anywhere and had no answers. so if some one could point me in the right direction i would greatly appreciate it.

thank you