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Do you have the serial number on the engine?
There was a big change on the 2000 model. But on your 135, there is a row of fuses on the ECU, part 219 in this diagram. Make sure that all fuses are still good. The most likely cause of this is that one if then is blown. If once you replace the bad one it pops as soon as you turn the key, one of the injectors is shorted.
There are just those 4 fuses. With the key on, each should show 12V of both of the small posts at the top of them.
How did you check for fuel pressure to the rail? It should be running at 90 PSI, air pressure should be at 80 PSI.
On the opti, there will only be fuel on 1 of the schrader valves. The other is for the air, which can be checked by cranking the engine over and watching the gauge go up.