It will not work with a si harness because from the firewall back that harness is missing the inj. signal wires along with the crank angle. You need to either rewire your dx harness to mpfi or swap both the interior and engine harness which means removing the dash and all the A/C stuff too. Much easier to rewire the dx harness.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.