No spark

Joe, thank you. After looking carefully through these steps, I did replace the crank position sensor according to your recommendation. However, these instructions are for a 2002, and I have a 1992. So, mine has no pin the lock the crankshaft, and the sensor looks slightly different. I did examine the tone ring, and it was undamaged. That was my first thought too. Let me give you some history to make my situation clearer. When I got the truck as a basket case about 3 years ago, the timing belt was off and as I dug into it I found the tone ring was severely damaged as someone tried to pry off the harmonic balancer- to which it is attached. So I replaced it, and became acutely aware of its vulnerability and importance. I rebuild the engine about 2 years ago, and it ran beautifully. Last spring, it just up an quit on me for no apparent reason. I found it would start intermittently, so I thought it was electrical. After replacing every component with no success, I sent it to a mechanic I trusted. He had it 10 months with no success. While there, the crank position sensor was replaced- again. (I don't think it was needed, but they did it anyway) I think it was there that the sensor was installed wrong. After 10 months, I sent a tow truck over and had the truck brought to an electric system expert. They found bad gas and bad injectors- surprise surprise. After all that, they figured the ECU was bad, and replaced it. Again. Well it cranked right up and ran fine for a few weeks. However, the check engine light was on. It died suddenly without warning, and I had it towed home. I discovered the mangled sensor, replaced it, and still have no joy. So, as you can see, it has be through many hands and now I am trying to sort out this mess. So, the long way to answer your question, I did install the sensor correctly, and I replaced the ignition module and one of the coils. With the mangled sensor I got codes on the OBD1 scanner, and now they are gone, so I know that is correct. I checked the tone ring for any warping as well as damage, and it passes through the sensor with no issues or touching. Now, if it was touching, that would explain the erroneous test result, but it is not. Luckily, all these parts I replaced have a lifetime warranty, but we have to get to the bottom of the problem- I did replace the ignition module before I knew the sensor was bad. Could that damage the ignition module? Could the ECU have been damaged as well? This doesn't make sense to me as the sensor only sends a signal. Is there a way to test the sensor without it being plugged into the ignition module? I have to start at the bottom and verify everything is working right. I would like to test that sensor while it is installed in isolation of the rest of the system, verify its correct operation, then move upstream.