Talking about gauge clusters? I don't think that's a huge concern in my eyes to worry about. I mean how many people that are looking at real cars to buy going to rip apart the dash assembly and start looking for cluster codes??? LOL Not to mention what owner is going to let a potential buyer do that?
As interesting as the gauge codes are, and learning is always a good thing, the firewall data tags and drivetrain codes are much more important to a buyer, and I just don't believe they would concern themselves with gauge codes. I see no money in it either which is the big motivator to cloners.
My car being an example of that. Thanks to William he helped me decipher that my car was originally a gauge car using many other clues on the car. However my dash cluster (the plastic fascia) had been swapped decades ago with a standard setup. No clock, no tach, and fuel gauge gone, and had not been cut on. However it had a console and gauges setup. I knew something was a miss.
Turned out it is a factory gauge car, the oil line grommet was present in the firewall and in the correct location, the engine wiring harness was correct for a gauge car, and we determined the console was also correct and original for the car. So someone simply changed the fascia on the dash and never put the clock or tach back in it. I do believe the speedo to be the original though.
None of this however changes the fact that it's a real Z with a real data plate and original drivetrain. So the entire gauge cluster in the dash isn't original now, but codes or not I don't feel it has any effect on the overall grand scheme of things. There are many other clues on a car to look for to determine what gauges it may have been optioned with. Thanks William