A cheaper way is to go to your local Radio Shack and pick up a piezo buzzer, 12 volt, and wire it across the green dash lamp. You can get them in various decibel ratings (loudness) for just a few bucks. I have one, but haven't installed it (yet) because I have Russ Thompson's self-cancelling turn signal, so it's not a big problem ( still ahppens sometimes though, because I turn the wheel so little to navigate many corners that it doesn't cancel sometimes).
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