Singer 7466 Manuel D'instruction page 36

Twin needle mode switch (
When using twin needles, push the twin needle mode switch
regardless of the stitch you selected. Doing so will reduce the
stitch width automatically and save broken needles and
possible damage to your machine.
While the switch is pushed and lit red, patterns with circled
numbers in the pattern reference guide cannot be selected
and a beep will sound.
Helpful Hints:
1. Always select the Twin Needle Mode prior to selecting
a pattern. This will preclude any possibility of the twin
needle breaking.
2. Turning off the machine returns the machine to normal
sewing mode. Twin Needle is only active when the
Twin Needle Switch is lit red.
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Twin needle mode switch
Commutateur de mode
d'aiguilles
Interruptor de modo de
aguja doble