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The 915 box has a plate attached to the diff with 8 magnets oriented N-S so that one pole is looking at the sensor lockout in the case. A reed switch is a 5.00 device that will close in the presense of a magnetic field. As each magnet passes by the switch closes (8X per revolution) and the speedo counts these switch closures.
I am using a set of Classic Instruments gauges and they have an interface box to change to the standard GM 16 pulse count.
Hall effect, and promimity sensors are different in that rather than being triggered by a magnet they "see" a passing toothed ring.
I am going to need a speed signal for my Subaru ECU as well.
How do the 915 box boys do this?
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