There are two separate FXL12 models with different wiring to the main RPM cable connector. It depends on the serial number of the module as to what the wiring is.
Main module Connector pinouts.The FXL22, FXL25, FXL32 and FXL35 have one common connector which is where the RPM and Switch loom plugs in. This is a 25 pin ' D ' connector. Note that the FXL22 uses +5 Volts DC for its switches and rpm pickups and the FXL25, FXL32 and FXL35 use +9 Volts DC. The FXL32 and FXL35 are derived from the FXL25 and only one pin is different, that is Pin 10. On the FXL32 and FXL35 it was decided to make it an earth seeking record inhibit, the same as the FXL22, so it can accommodate early Dyna ignitions and late MSD ignitions which have earth seeking two steps.
The Four RPM cables will have heat shrink tubing for insulation and identification. The color corresponds to the color of the traces on the DOS based software.
RPM 1 Engine RPM cable if fitted, will have Blue heat shrink.
RPM 2 Input shaft RPM cable if fitted, will have Red heat shrink.
RPM 3 Drive shaft RPM cable is always supplied as standard, will have Green heat shrink.
RPM 4 Front Right Hand Wheel speed if fitted, will have Black heat shrink.
Pin Function: ( Viewed from behind the connector where all the wiring comes out )
Pin 1 +12Volts main power - with short lengths of Red heat shrink.
Pin 2 RPM 1 Signal - Engine rpm signal return. White/Blue wire.
Pin 8 RPM 4 Signal - Front Right Hand Wheel speed signal return. White/Blue wire.
Pin 9 RPM 4 Power - Front Right Hand Wheel speed sensor power. White/Orange wire.
Pin 10 Dual purpose input. On the FXL25 it is a voltage seeking input usually used for monitoring when a Nitrous solenoid is switched on or off, and on the FXL22 and FXL32 it is an earth seeking input used as a record inhibit to suit Dyna ignitions, new style MSD ignitons or Junior dragsters using a switch on the brake pedal. Usually has short lengths of blue heat shrink tubing for identification purposes.
Pin 11 Wide Open Throttle switch power. This is a White/Blue wire which goes to either contact on the Wide Open Throttle switch. There will always be a companion White wire inside the cable. This White wire is an earth from the logger. The shield is earthed at the logger end of the cable. It is NOT earthed at the switch. Wrap insulating tape or put on heat shrink tubing at the switch end.
Pin 12 Two Step or Transbrake switch input. Single White wire with short lengths of Green heat shrink tubing. This is a voltage seeking input on all models.
Pin 13 Shift Light +12 volts input. Single White wire with short lengths of red heat shrink tubing. DO NOT Confuse this wire with the main +12 Volts input.
Pin 14 Master earth. Has short lengths of Black heat shrink tubing.
Pin 15 Earth for RPM1 Sensor
Pin 16 Earth for RPM1 Shield
Pin 17 Earth for RPM2 Sensor
Pin 18 Earth for RPM2 Shield
Pin 19 Earth for RPM3 Sensor
Pin 20 Earth for RPM3 Shield
Pin 21 Earth for RPM4 Sensor
Pin 22 Earth for RPM4 Shield
Pin 23 Earth for Wide Open Throttle Switch
Pin 24 Earth for Wide Open Throttle Switch shield
Pin 25 MSD or Dyna Ignition tacho terminal take off. This will have short lengths of Blue heat shrink tubing. Not to be confused with the nitrous switch input on pin 10.