Thomaspin has a description on his website of how he spliced a Radio Shack buzzer into each of his turn signal flashers. Being as when the air is blowing and/or the radio is on I can't hear the clicker, this sounds like a great idea. A chime would sound even better.

How big is the chime?

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Semibodacious Transmogrifications a Specialty

1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)

"Time flies like and arrow, yet fruit flies like a banana"
---Marx (Groucho)