Well i'll give this one a shot. But I think your motor is a 3.0
1. If you rpm guage or tach as it is called gets its referance from the green wire at the coil for have been known to have a problem with the plug that pluges into the coil. Try to tighten the terminals up and spray a little wd40 in the plug and connect it and disconnect it a couple times. It can also make it hard to start.
2. Another thing to check and there known for this also, taurus, sable, tempo you will have to remove the plate that is under the steering wheel the one that you knees almost hit. This will expose the wireing for the switch they be yellow wires look them over real close for burning or burn't wires. But I think you coil may be your real problem and if you have not done a tune up might be good time to do one.
3. The EGR thing is. The DPFE which is (duel pressure feed back) sensor. Look for the EGR pipe you will see a rubber hose connected to this pipe if it is not that is what it is telling you EGR flow insufficient. The sensor cant read the flow cause that hose is not on there or it is burned into or the DPFE is bad or it is pluged it is a little grey looking box just follow the little rubber hose up to the box the tube gets pluged up. Everything souldns electric to me check the COIL.(NOS)
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Thursday, March 16th, 2017 AT 12:44 PM