petrol gauge
fill a gerry can up and wait for it to run out 
and THEN take the needle off and put it back on where YOU want it to read EMPTY 
OR
FILL the car up to the brim and as above set the needle to full
and THEN take the needle off and put it back on where YOU want it to read EMPTY OR
FILL the car up to the brim and as above set the needle to full
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