Hi Brian,
I have attached the wiring diagram which should be ok for your car.
The solution is not that difficult:
One contact off the momentary toggle switch should be connected to terminal 5 on the washer switch, the other contact to ground.
This should operate the wiper motor when the main wiper switch is in the off position as long as the toggle switch is pressed.
Hope that helps (and will not set your car on fire :-) )
Thomas
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