Question Stepper motor switec X27 and stepper.h library

Okay my lap time in LFS is 15 hours i need help

ive been at this all day and night and its 10 to 1am and im stuck,.

i read about this here by RacingMat

https://www.xsimulator.net/community/threads/driving-diy-cluster-gauges-with-gamedash.5896/

and well the code and im guessing the library is very old and no good

im using a L293D h Bridge with RacingMats code and it didnt stop the jutter and the slowness

so i thorght to hell with it ill use the Stepper.h library arduino comes with.....

i cant get it to move the gauge it just makes a noise and sometimes locks up like its trying to do something

here a picture of what i have

so here is my code i have for the stepper.h library

Code:

// D8 to p2, D9 to p7, D10 to p10, D11 to p15. 12V on pin 8 only

#include <Stepper.h>

int stepsPerRevolution = 600;        // Change this to suit the number of steps per revolution for your motor
byte Rpm;

Stepper MotorRPM(stepsPerRevolution, 8, 9, 10, 11); // initialize the stepper library


void setup()
{

  Serial.begin(115200);         

} // End of setup()



void loop()
{
  if (Serial.available() > 0)  {
    Rpm = Serial.read();
  }
  MotorRPM.step(map(Rpm, 0, 255, 0, stepsPerRevolution));

}