In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Capt. Quirk wrote:

RPM, RPS, Accelleration in Radians/sec/sec, just about anything you want to do is possible. Parallax sells everything to do it and there is a [url=http://www.parallax.com/html_pages/robotics/machining/RPM_display.asp]BS2 RPM page HERE[/url] 

There are code examples within this forum to display the information with a serial or parallel LCD too. The code for SXB and the Melexis hall sensor and a magnet is really simple:

COUNT  Pin, Var, 1000

RPM = Var * 60

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