I used the Meter Match to calibrate a VDO fuel gauge to the stock sender. It works as advertised and is VERY versatile. You can even calibrate reverse scale readings where the gauge reads opposite of the sender output.
The fundamentals is that you need to have two know conditions such as a full tank (easy) and an empty tank, or at least a known quantity at empty where you want the gauge to read E (tougher). You could drain the tank and add 5 gals for example.
The MeterMatch has some simple controls that allow you to adjust the needle position to the sender output condition. Microprocessors are magic.
Here is a thread where we talk about it:
http://pantera.infopop.cc/eve/...421034756#7421034756