If I run a megasquirt with the 60 tooth flywheel I will use the outputs from the ecu for the tach. I probably won't bother with the speedo until I have a 722.6 in the car and I can deal with it then.
If I put a stock ECU in all I will worry about is temp, oil pressure, and a wide band O2. The goal with that set up is to be able to drive the car. It would not need to be perfect because at least as far as I can tell its basically drop in once I pull the parts from a junkyard car as long as its non asr and doesn't have an immobilizer. If I really want I could always stick a w124 dash in it too if I wanted speed and the tach to work with that setup.
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