First the ADC needs to be converted into KPA for yourformuls to work.
You will need to have the ADC setup with a 3.0 volt reference.
Using the old formula of
y = mx-b
y = output 'Volts
m = slope
x = input units
b = offset

You are wanting to read form 0 to 30 amps.
You are wanting to read form 0 to 3.92kpa.
Output is 0.6 to 3 volts.

Start off by look at the output in volts. You have a 2.4 volt span. Giving a span of 3.92 / 2.4 = 1.633
m = 1.633

The offset. Starting at 0.6 volts. 0.6 volts = 0 kpa. The offset is 0.6 * 1.633 = 0.98
b = 0.98

Plug all this into the formula and lets say the input is 3.0 volts.(full scale)
y = (1.633 * 3) - 0.98
y = 3.92

Now convert this to an 10 bit PIC resolution.

10 bits ADC = 0 to 1023, 1024 steps.
At 3.0 volts one volt of input will will read 341.
Spanning 2.4 volts or 818 steps (2.4 * 341).

New value for m. 3.92 / 818 = 0.00479
m = 0.00479


The new offset starting at 205, (0.6 * 341).
205 * 0.00479 = 0.98
b = 0.98


y = (ADC * 0.00479) - 0.98
ADC = 1023
y = 3.92kpa

ADC is from the sensor.

Now for some code.
Code:
  '  m = 0.00479
  '  b = 0.98
  '  y = (ADC * 0.00479) - 0.98
  '  ADC = 1023
  '  y = 3.92kpa
    M   CON 479     'm = 0.00479 * 10,000
    B   CON 98      'b = 0.98 * 100
    ADC VAR WORD     'INPUT FROM SENSOR
    Y   VAR WORD     'KPA
    Z   VAR WORD     'DUMMY VAR
    Z1  VAR WORD     'DUMMY VAR
    'V =  SQRT((2 * (Y/1000)) / 1.225)
    V   VAR WORD    'METERS/SECOND
    D   CON 122    'AIR DENSITY
    
    START:
    ADC = 1023  'FULL SCALE HARD CODED, NO SENSOR
    Z = ADC * M
    Z1 = DIV32 1000
    Y = Z1 - B
    Z = (2 * Y * 10000)
    Z1 = DIV32 1000
    V = SQR(Z1 / D *100)
    LCDOUT $FE,1,"KPA= ",DEC Y/100,".",DEC Y//100
    LCDOUT $FE,$C0,"M/S= ",DEC V
    PAUSE 250
    GOTO START