How to disable voltage limiter inside gas gauge?

There are 2 different methods. The first was published to a Imperial website many years ago. That is the method that RTE ran with and republished. The second was discovered by me and my brother about 12 years ago. the 2 methods cannot be mixed.
A typical 2 post gauge has only 1 current path through those 2 contacts. A 3 post gauge has 2 current paths through 4 contacts. The tape on the back isolates the gauge can from chassis ground. Then the switched 12 volts shouldn't go to the fuel gauge. it can, if you open the gauge and physically disable the limiter. I
In the more common instrument panels the 12 volts goes to the plug in type limiter, Not to the a gauge. So... 12 volts goes to the replacement regulator. Take it out of the round harness connector, add to its length if necessary, and route it directly to the regulator, no matter where you decide to place it. Now your 3 post fuel gauge will only function like any other 2 post gauge even if you dont open the gauge and disable that limiter.
I should add that if you dont go in and physically disable to OEM limiter, a volts meter would show 5 volts back feeding to where 12 volts once was. It can't go to ground through the housing. Electric tape stopped that. Without purchasing a nylon nut for that gauge stud, the 5 volts will go all the way to the contact pin where the 12 volt wire was. Thats where it ends. Its not a short, or a problem if there is no wire there.