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I'm just going off what here. They call it an ECU. My FSM calls it a "control unit". Either way, the analog wizardry box that makes the engine go vroom.

Actually, the the ECCS was introduced with the 280ZX's. The ECU is used in both but started with the 280Z's. Generally, ECU stands for Electronic Control Unit or EFI contol unit. Edit - not sure what ECCS stands for. Of course, it's all translated from Japanese, so the words might not make the most sense in English. But that's how ECU and ECCS are used in the FSM. From the 1982 FSM, below. Might be the the ECCS "computer" should actually be called the ECCSU. There have been some discussions about what should be called a computer. I don't think that either of these actually do any number crunching.

Hey,@Parman I was wrong about the symbol being for YEC brand. I had a look at my pats stash and found that is actually for Daiichi Mfg Co Ltd.. Here are a few pics of some more ignition parts with the same symbol. Also shown are an OE Hitachi contact point set and condenser, you can see the Hitachi logo on those.

Is your 260Z a manual, or an automatic transmission? On the manual cars, the EGR relay only controls the EGR system. But on the automatic trans cars, the EGR relay also controls the ignition timing by switching the ignition module to use either the retarded and advanced pickups from the distributor. So, if your car is a manual, then yes... The only implication of removing the relay (and it's associated wiring) is to the EGR system. But if your car is an automatic (or came from the factory originally as an automatic), then there will be implications to the ignition system as well.

There are times to be pedantic. This isn't one.

No idea on that one.

Why not contact “junkyard Jenny” She probably has what you need to replace your existing mechanism. Sounds like you might need both sides. Good people.