The TNC Tach is back in production and in stock.
I called and ordered one from Powerflite yesterday.
http://www.rcpowerflite.com
Rick said that he had about 100 of them available. It looks like the TNC Version of the PT10S (Accurate to 10 RPM).
December 2002 post from Rick on the TNC TACH
http://www.rcuniverse.com/showthread...ad%40bktsi.com]