AS Dale says, you can'y make the motor run without a speedo. As well as a sophisticated tester Dale links above, you can get one of these...
http://www.racing-cars.com/pp/Manufa..._RC/CR162.html
...which will tell you that the sensors are working correctly. Unless you want to know the actual performance of the motor using a checker, the sensor tester tells you all you really need to know - that the sensors are working correctly and won't damage your speedo. HTH
