I am chasing up the factory tacho wire for the series 6 RX7 93. any help would be great. Also there is 2 looms within the car, passenger side and driver side if you could also let me know which side this wire goes to.
Thanks in adavance

 

Sarah,

The wiring diagram shows the Tach picks it source up from the CPU and Speedometer. It does not list a source wire color or picture any source wire. In the tachometer troubleshooting, they do list a wire to check as follows. I am only assuming this is the wire. It is on Page C1-11 in the 1993 Mazda Factory Workshop manual. If you do not have it, there are several places to download it. It states to check the (Y/L)-Yellow/Blue wire at the instrument cluster plugs C1-01 (terminal 3F). It is in the 12 plug connector that has only 10 wires. The other source of the tach shows back at the ECU. It is the smallest 12 pin plug and it also is the (Y/L)-Yellow Blue wire (terminal 2B)

This is from the Left hand drive US version. The test states there is supposed to be 3-6V at idle between the wire and ground and 0V with ignition off