MS2 R57 do i need it????
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R57 is a spot for a pullup resistor. Using it depends on what type of input circuit you plan to build and is optional. For MS3 on a standard miata, I set up CKP input through the VR circuit and populate R57 with a .5-1k ohm resistor (the exact value isn't terribly important within reason).
Additional info is found in the manual:
http://www.msextra.com/doc/ms3/ignition.html#tachint
Additional info is found in the manual:
http://www.msextra.com/doc/ms3/ignition.html#tachint
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