The LM4 is pretty rare, good find. The gauges that you will run will depend on what your plans are for your engine. I'd start out with Speedo, Tach, Fuel Level, Oil Pressure, Water Temp and Volts. I wouldn't go with a wide-band unless you are doing the tuning yourself.
So, what are your plans for the car?
So, what are your plans for the car?