Engine running light hook up for deaf

My dad has very bad hearing. He has tried several times to crank the running engine. Does any one have an easy clean way to conect a bright red light to show engine is running? I;ve heard of people doing it but not a mechanic so will need some help here as to where to tap in ti the wiring to get this set up for him. Any suggestion will be appreciated.

[boats.net]

What engine do you have?

[robert graham]

Maybe install a tachometer for dad to look at? Once he got used to the tach and glancing at it, he would get a good "feel" for when the motor is running. I know some of the smaller 4 stroke motors idle very smoothly and quietly. Better to deal with this before dad screws up a starter motor or flywheel. You mighty lucky to still have your dad! Good Luck!