A pump relay for a car running Bosch K-Jettronic ( 16V Golf, Early Audi 80's and 100's , XR4i) also Peugot GTi's had them I think.
The Tach relay senses ignition pulses and cuts the fule supply when the inition pulse goes dead.
You an get a good inertia cutoff from the engine bay of a rover 200, or from a sierra EFi ( wheel well up to 1990, drivers kick pannel 90> )
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