well you shift the manual tranny, so ya just have to install it with the necessary parts, and hook up the optional speedo cable, and boom you should be good to go, the only other thing that would be on the manual tranny would be the rev light switch.
I'm pretty sure all 4 wires and both sensors are for reverse.. There are three wires low and one slightly higher than the middle but I believe all four have to do with reverse. Harder to determine reverse in a manual trans.. Likely the harness is different between the two.
i got a whole mazda i'd sell. in pieces, but it's bagged and bodydropped. probably let it go cheap. all it needs is a engine and to be put all back together...