KPI Visual Without Showing Values

Hi everyone, 

I have an issue with default KPI visualization. I choose values actual/target and create the visual with color option (green/red). But for some reason i need to hide values in visual, just to show green check mark if target achieved or a red cross mark if target is not achieved. 

I've tried to use "if formula" to define this and give numbers, 1=success 2=fail and get green check mark / red cross mark with URL. 

Problem is, no visual option helps to hide values, i just want to show green check mark / red cross mark.  Please help. 

Thanks,

Caglar