92 2.3L vert tach & water temp gauge issues

Not quite sure what you are saying, but I assume that you moved the plug wires tht were originally on the front coil pack and going to drivers side engine to the back coil and back coil wires to the front?

I know that the DIS fires one coil and then the other right behind it, maybe switching sides that fires 1st helps in the ignition department?

I wonder if you have a bad coil in one of your coil packs. You can verify that by unplugging one of the packs and see if the engine runs on all 4. I had a coil out on both packs on mine - but on different cylinders - so it would run ok when both were plugged in, but missing when only one was plugged in.

As for the funky tach readings - i had that issue with my car and once i replaced the coil packs and DIS module it returned to normal. The tach would read fine sometimes and hover at the 3500 to 4000 range others.

I was mistaken about the water temp gauge. it is still only going up just above 130 unless parked & idling.

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That is simply due to the factory junk sending unit and gauge. I've owned 5 or so different fox body mustangs and have yet to have one with a good temp gauge. They just are not reliable as a a true indication of coolant temp. but can act as a "dummy" light if the engine starting to overheat.

I have a dimmer switch issue that causes my gauges to work but not read correctly. If the lights are on it reads high on everything. When there off it reads low on everything. As long as it runs I really dont care what they say.