The only changes I have done to the 737, is the following (737-200 in this case, but similar in all the other models):

[i][TurbineEngineData]
fuel_flow_gain = 0.002                                   //Gain on fuel flow
inlet_area = 9.6                                   //Square Feet, engine nacelle inlet area -- the original setting was 19.6
rated_N2_rpm = 29920                                  //RPM, second stage compressor rated value
static_thrust = 16000                       // The original setting was 23000 - much too powerful IMO
afterburner_available = 0                              //Afterburner available?
reverser_available = 1                                  //Thrust reverser available?
ThrustSpecificFuelConsumption = 0.385          //Thrust specific fuel consumption (Jets)
AfterBurnThrustSpecificFuelConsumption = 0  //TSFC with afterburn/reheat engaged

These changes prevent the 737 from performing like a "rocket ship". ;D

fsxpaul did a great job with the V-One gauge, but I just don't use it. Like Tim, I don't worry too much about things like the correct EPR. I operate on the  airspeed.