[scarceller]

Flywheel ref and speed sensor should measure 900-1100 ohms.

Spark cables on the RHS are longer, thus higher resistance is normal.

CHT sensor at 45F temp should be around 1000 to 1300 ohms (1.0 - 1.3 Kohm)

I agree with Rick that testing fuel pressure is in order. You don't need the exact fitting to put on the FP port. You can try adapting a hose from the gauge so that the hose just fits over the threads of the port tightly, then use a hose clamp to clamp the hose tight to the port.

With engine running at idle you should have 30-32PSI then while it's idling remove the vacuum line from the regulator and the pressure should increase to 36-38PSI
If indeed she's rich then it could be that the vacuum hose to the regulator does not have vacuum for some reason?

The other thought is maybe the carbon track in the air flow meter has failed? If this happens then the engine will be under fueled at those give air flow rates that the track is worn in. You can sweep test the AFM by pushing the barn door open while monitoring the 0-5vdc output signal. This test is done with engine OFF and key in 'RUN'

Finally, if you can borrow a DME for testing we would rule out DME issues. Or take your DME and test it in another working 84-89 car.