Miata Mailing List: February 1999, Message #243

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Greetings!
  This is intended for those out there who obtained info from me on the TEC-II 
installation on my '91 turbo Miata. I discovered a way to simplify the 
installation a little bit more and eliminate some clutter under the hood.

  Six months after completing the installation of the TEC-II, whilst perusing 
the electrical schematics for my '91 Miata, I discovered a way to eliminate 
the GM thermosensor provided by Electromotive and use the stock Miata 
thermosensor. The Miata has one thermoswitch for the radiator fans, one 
thermosensor (schematic C, connection C-02) for the intrument cluster, and one 
thermosensor (schematic B-1b, connector B1-17) for the stock ECU. Both 
thermosensors are wired to connector X-12 which connects the front harness to 
the injector harness. The stock ECU thermosensor can be used with the TEC-II 
by connecting TEC pin 1 (CLT) to connector X-12, wire L/W (blue with white 
stripe). Connect TEC-II pin 2 (S GND) to connector X-12, wire B/LG (black with 
light green stripe). This will allow you to use the stock thermosensor and not 
have the brass fitting arrangement shown in the photos I sent to you. I will 
be modifying my installation to reflect this.

Regards,
Barry