It really shouldn't matter what engine you have or what transmission. The only difference would be if you have a V6 guage, the resistor on the back of the tach "may" I say MAY be different. Extremely easy to fix that by soldering in the correct resistor. The I4 is going to have the same resistor regardless of tranny. The only input into it is the tach wire. That's the only thing you have to see if you have. There aren't any extra/missing/different wires between the MTX and ATX.
HTH John
