I don't know if 'raw', 'voltage', 'pressure' are float or integer or unsiged.

Does the glcd library have a function to print an integer ?

When you want to change a float calculation into an integer calculation, you have to know if the value can be negative (signed integer needed) and the maximum value (will it fit into a 16-bit or 32-bit integer).

In this case, I think that the pressure can not be negative, and the 0.5V is the offset.

To calculate the pressure from the raw value (let's forget the offset for now) = 5 / 1023 * 37.5
It means dividing the raw value by 5.45

That can be done by multiplying the raw value with 10 and divide it by 55.
Or mulitply by 2 and divide by 11

The raw value is maximum 1023 and that times 2 will fit into a normal integer.

int rawADC = analogRead(A1);
//substract 0.5V offset
rawADC -= 102;
// voltage is / 1023 * 5
// pressrue is voltage * 37.5
int pressure = (rawADC * 2) / 11;

Reading the pressure without any average of a few samples ? Is your pressure value stable ?