This Universal on/off switch also features a momentary switch which will work with most any power supply or flasher that requires a momentary to change flash pattern.  It comes complete with wire and underdash mounting bracket.   

This switch is available below in 2 different models.

Positive Momentary Switch - This unit will send 12 volts positive power when the momentary switch is pushed and used with LEDs that require 12 volts positive power to change the flash pattern. 

Negative/Ground Momentary Switch - This unit will provide Ground when the momentary switch is pushed and used with LEDs that require a ground to change flash patterns.