temp sensor, FICD, IAA, etc all use the same type of connector on your ‘91 Z. I used this type to replace them on my Z (better than old Nissan design): https://www.ebay.com/itm/84-86-Z31-300zx-6pc-EV1-Fuel-Injector-Connector-Pigtail-Quick-Release/301997412646?hash=item465072d126%3Ag%3A85oAAOSwAvJXAZLe%3Asc%3AUSPSFirstClass%2108807%21US%21-1&_sacat=0&_nkw=300zx+injector+connector&_from=R40&rt=nc&_trksid=m570.l1313 But this style is also available - just slightly different: https://www.ebay.com/itm/6x-Fuel-Injector-Connector-Wiring-Harness-For-Nissan-300ZX-N-A-Non-Turbo-90-93/263590445045?hash=item3d5f36fff5 NOTE - you will have to remove the plastic locator tab on the injectors, FICD, etc but it only takes a minute to Dremel them off. None of the devices are voltage polarity sensitive - so connectors can be fitted on without that worry.
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