For those not inclined to read it, the Wisconsin DMV website linked, among other things, says this:
"The National Highway Traffic and Safety Administration (NHTSA) and the Environmental Protection Agency (EPA) allows for vehicles to be imported into the country once the vehicle has reached a certain age. However, NHTSA and EPA are not responsible for regulating the operation of motor vehicles on public roads in the U.S. or for titling or registering motor vehicles for such operation: that is the responsibility of the individual states."
Which means that Wisconsin is making its own rules regarding which vehicles it will allow to be registered/licensed there, regardless of the Federal rules pertaining to importing. So while it's perfectly legal to import your car into the US, Wisconsin is free to decide if they want it licensed for use on their roads, and it looks like they don't.
The Federal government will grant 25+ year old vehicles an exemption to Federal Motor Vehicle Safety Standards, but the State of Wisconsin requires proof of FMVSS compliance for
any age vehicle, if I'm reading their website correctly. The proof they require is in the form of either: a Federal Certification Label (which only cars manufactured for the US market will have);
or: a Registered Importer label.
Your car won't have the FCL, and there's no way short of counterfeiting to get one, so the RI label is your only hope in WI. The only way I'm aware of to obtain an RI label is to have your car imported through the services of a Registered Importer, who will see that your car is modified to comply with all FMVSS in effect as of the car's manufacture date. This can include mundane things like swapping the speedometer for one that reads in miles rather than kilometers, or replacing the headlights with sealed beam types, but it can also include some big ticket items like side impact protection and airbags. If your car is a 1994, you needn't worry about airbags, since the FMVSS pertaining to them wasn't in effect when your car was manufactured, but your car might require side impact protection, the FMVSS for which was implemented beginning in 1994. There would probably be other things, too. Some simple, some expensive or maybe impossible. Best bet would be to contact a Registered Importer and start asking questions if you choose to go this route.
The NHTSA has an updated list of Registered Importers here:
www.nhtsa.gov
If you haven't already, find one near you (I didn't see any in Wisconsin, but there's a few in nearby states) and give them a call. Be aware that a Registered Importer who's not in Wisconsin might tell you you're wasting your time, since 25+ year old cars don't need to comply with FMVSS in most other states. Hopefully, they'll be familiar with Wisconsin's more restrictive laws.
I briefly thought they (WI) might let you get away with registering/licensing it as a collector car, but more careful reading of the relevant code reveals this:
“Special interest vehicle" means...A motor vehicle of any age, of which the body has not been altered from the original"
It would be hard to argue that your car's body hasn't been altered from the original, though I suppose you could try. Worst they can do is say "no".
It
is possible to register/license your car in another state with more lax regulations, but there are a couple of potential pitfalls to this. One, Wisconsin has rules regarding how long you're allowed to reside in WI with a car that's not plated there (looks like 60 days). You could simply flaunt this rule--many people do this and the risk is small. The other problem with getting plates in, for example, Montana or Florida, is that it won't change the fact that your car doesn't meet Wisconsin's rules. While you wouldn't need the FCL or RI label in other states, you'd still need it for Wisconsin if you try and transfer and you wouldn't have it.
I think your interpretation of the Wisconsin DMV website is correct, and I'm reading it the same way, but you might try calling the number on their website and see if you can reach anyone who's well versed in gray market vehicles that have been imported under the 25 year Federal exemption. Again, it can't hurt to ask and it's always best to go the the source.
Sorry I couldn't be more help. Anyone on here from Wisconsin and driving an import?