"Scott Dorsey" wrote in message
...

SNIP

If it has usable response up to 4 KHz, it's a microphone. If it can't
reproduce an intelligible voice, it's something else.

That said, you can KIND of get intelligible voice from an oil pressure
sending
unit.
--scott

Eureka!!! A new color in the pallet! And, my best laugh so far today.
Thanks.

Steve King