Yes, a 280ZX TPS (Throttle Position Sensor) can work on a 280Z, but it is not always a direct plug-and-play swap due to variations in connectors and thickness.The stock TPS for both cars is generally a simple on/off switch (for idle and wide-open throttle) rather than a variable potentiometer.Key things to keep in mind:Connectors: 280Z and 280ZX TPS units often use different 3-pin connectors (square vs. rectangular). You may need to splice the wiring or buy an adapter (such as those from Z Car Depot) to connect it to your 280Z harness.Thickness and Spacing: There are two different switch thicknesses (often referred to as "thick" and "thin" switches) used across 1975–1983 models. If your 280ZX replacement is thinner than your original 280Z unit, you will need to use washers as spacers to ensure it mounts correctly and aligns with the throttle linkage.

Step-by-Step Testing Procedure1. Locate the TPS and Set UpTurn the ignition to the OFF position.Locate the black TPS unit on the side of the throttle body.Disconnect the wiring harness connector from the TPS.2. Test Idle ContactsSet your multimeter to Ohms (Ω) or Continuity.Connect one probe to the center pin (common) and the other probe to the rear pin (closest to the firewall).With the throttle closed: You should have continuity (a beep, or 0 Ω).With the throttle partially opened: The continuity should break (OL/Infinity) immediately as the throttle opens.3. Test Full Throttle (WOT) ContactsKeep the first probe on the center pin and move the second probe to the front pin (closest to the radiator).At partial/closed throttle: You should have no continuity.At Wide-Open Throttle (WOT): The circuit should close, giving you continuity (or 0 Ω) as soon as the throttle plate is pushed past roughly 35 degrees (about 2/3 open to full open

My test is off vehicle and it passes. The idle contact and wide open throttle test, unable to perform partial.

My location, long black tote, silver spray paint top