If it’s something you’d really like to have no matter how, and if your PRT version is at least v10.3, then you could see if you’re happy with a workaround for this particular code: making the indicator draw the lines through graphical commands rather than through variables returned, keep an empty return line, and keep the options settings to display the crosshair values of other stuff not belonging to this indicator (assuming you display this in the price window so it’s self-adjusted around price rather than drawn too far away from the +1/-1 range you’d get with an empty return indicator in a separate window). Something like:

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