Reference lines in a Sales versus Target gauge chart

Recently, while delivering a proof of concept, I was asked by a customer if we could create a "Stephen Few Bullet chart" in Sense. This is not possible out of the box, for the simple reason that a bullet chart involves overlaying a bar chart on top of a gauge chart, and overlaying objects in Sense is not allowed. So, I thought of delivering the same result using just the gauge chart and making use of reference lines.

Getting ready

Load the following script in the Qlik Sense Data load editor; it gives information about the Sales and Target values for four countries:

LOAD * INLINE [ 
Country, Sales, Target 
USA, 10000, 8500 
UK, 7000, 9500 
Germany, 5000, 4500 
Japan...