FIP gauge: code for Value = 1 re range of %s, not a specific %

I am putting a FIP gauge together and want an 'almost empty' fuel warning light.  As a non programmer, I have figured out that the following will work to shift an image when fuel is 7% of capacity. (7% is 5 gallons in a BB58 tank)

<Element>
    <Image Name="light_red2.bmp" ImageSizes="28,28,28,28" />
        <Shift>
        <Value Minimum="0" Maximum="1">(A:FUEL TANK LEFT MAIN LEVEL,percent) int 7==</Value>
        <Nonlinearity>
            <Item Value="0" X="315" Y="150" />
            <Item Value="1" X="100" Y="145" />
        </Nonlinearity>
        </Shift>
     </Element>

However the warning light will only stay displayed while the tank is at 7%. When it drops below 7% the light goes out.

Can a more knowledgable person please  supply the VALUE code to create a value of 1 for all percentages 0 - 7    (or 8, 9, etc ) or if 0 is problematical, then 0.01 - 7