Just get a Haltech CAN wideband, no need to wire any delay circuits, or relay, etc.
Since I've moved to a Haltech CANbus wideband, I have not replaced a single sensor for over 5 years (if not longer, can't remember when moved to Haltach).
Small analogue delay circuit with a relay. Just need a trigger, say, fuel pump running for more than 5s or so?
Or, you could go full mental and write a sketch for an Arduino.
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