No fuel pressure or Fuel Injector Pulse

Do you have spark at the plugs, engine cranking? If you don't have anything, Check for rpm/pip signal, comes from the tfi module. I can't say the module is faulty. With the key on or cranking do you have primary voltage at the coil?

Any applicable trouble codes?

You may have two fuel pumps, low pressure pump in the tank, high pressure pump along driver side frame rail, under the hood.

With engine cranking, check voltage to and from the inertia switch. Engine cranking use a noid lite for injector plug, does it pulse? Voltage to the injector/s is a red wire, goes hot with the key on.

Any applicable trouble codes?

Any voltage on that red wire at injectors, key on? Saying no pulse can mean either no voltage or no ground, which is it?

With two fuel pumps, did you check both?

Is the engine and computer compatible? Same year--make--model-- engine size? If not, it may not work?

Fuel pump relay diagram below. Yellow wire is voltage from ignition switch. When the relay is energized, that line with the arrowhead moves to the yellow wire terminal, voltage then flows to inertia switch. The coil side of relay has to have voltage and ground in order to energize. The red wire is voltage, same voltage that goes to injector/s. The tan wire with white tracer is ground for the coil side of relay, controlled by the computer.

You may have to check all voltage and grounds at the computer.

What about voltage on the red wire?

Make sure battery has a full charge and fuses are all ok. Take the computer connector loose, check that no pins are bent or pushed back in the connector. Yellow wire pin #1 is voltage from ignition switch. In the diagram are ground pins and v-power. I don't know what else to tell you.

I'd hate to see you replace the computer and it turn out to be something else.