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more details mate, what year car, what are you trying to do ?
The fan has nothing to do with the cluster, just wire it up to the haltech via a relay. (do a search)
The cluster will vary with each model rx7 (or older)
the haltech comes with multiple outputs, the only one I needed to rewire was the tacho (which is **** easy) if you do a search there is about 3 thread on how to do it.
There is a yellow/blue wire with a female bullet connector near where the stock trailing coil was located. Actually wrapped in with the coil connectors. That is the tach input. You will need to connect DPO 1 from the ECU to that wire. Once it's connected enable DPO 1 as Tacho. The settings with me 12V Pull-up, 50% duty, 4 pulses.
You can only use DPO 1. No other output will work.