1990 tracker -no start FI fuse?

[fixkick]

The ECU must match your car.
the 91, has many changes (8v)
a newer Throttle body and injector and new ISC that and ISC coil resistance not the same 2x different.
The ECU not runs all spark with a direct ignitor. and runs advance.
The ECU will only work on lacking 91 distributors, and if the 91 ECU can not sees proper advanced spark it sets, it will fail. hard.
The EGR is not the same nor EVAP nor o2 sensors.
The pin out the ECU to harness is not the same.
it will take more than skills. to use the wrong ECU, my list is short.