#define EXT2_STEP_PIN E2_STEP_PIN

#define ORIG_E2_STEP_PIN         64

However in pins.h I cant find the line that defines pin0, does someone know the #define aux-1 syntax here?

#define X_STEP_PIN         54

#define X_STEP_PIN         54

#define UI_DISPLAY_RS_PIN        -1       

//#define U8GLIB_KS0108

"#define Z_PROBE_ON_HIGH 0" 

#define EXT0_PID_INTEGRAL_DRIVE_MAX 140

You only need to change #define YAXIS_STEPS_PER_MM 80

#define YAXIS_STEPS_PER_MM 80

#define SDSS            10

//#define TRY_AUTOREPAIR_LCD_ERRORS

#define HEATED_BED_MAX_TEMP 130

#define FEATURE_CONTROLLER 2

#define ENDSTOP_PULLUP_X_MIN true

#define XAXIS_STEPS_PER_MM 800

#define X_ENABLE_ON 0

#define EXTRUDE_MAXLENGTH 100

  #define SIG_USARTx_RECV   SIG_USART1_RECV