I like two...for the sole purpose that the others dont have enough meat between the 5" gauges, it will be weak right there....

Where will your radio go? I had my two 5" Autometers with a Vac Gauge btween them dead cent with driver...off to the right I had the two water, Volts....over the other two...Fuel, Oil Pressure...Then the radio in the regular position and the heater controls right above...

I'll upload a pic if you life....Mine more or less looked like a 69 A-Body 340 Rallye Dash