If you want to build the CenTec meter for the Minelab Sovereign but are afraid of voiding your warranty here is an easy solution. Build a cable extension to fit between the Minelab box and the coil connector with the meter connections made to the extension.
You will need the following items.
1 Chassis mount connector part number CMC6 (Buxcom Co., see link below)
1 Microphone plug part number CBC6 (Buxcom Co., see link below)
1 connector sleeve from a PL259 antenna connector (Radio Shack).
1 RCA type phono jack with wire attached (stereo connector wire) you can use the male and just plug it in to the meter or you can use a short female and use a short male to male extension as I did with mine.
About a foot of 5 conductor wire.
Soldering iron and solder.
Small phillips screwdriver.
Wire strippers and cutters.
RTV Silicone.
Good eyes, steady hands, and something to hold the connectors while soldering.
The connectors needed can be purchased from BuxComm Co. or Thomas Distributing at the following links.

Thomas distributing Chassis mount link 2 (cheaper)

Thomas Distributing Microphone plug link 2 (cheaper)
OK, start by stripping about 5/8" of the cable cover at each end. Then strip about 1/4" of the wire cover from each wire.
Disassemble the microphone connector to allow access to the solder connections. Solder the wires as shown in the following wire map. Remember to run the wires through the PL259 sleeve and the barrel of the microphone connector before soldering. Also make sure the barrel and
sleeve are facing the connectors properly, the last thing you want to do is to have to unsolder everything to turn them around.

Notice in the following photos that each connector has markings for the pins.
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Once you have everything soldered as shown assemble the microphone plug and screw the PL259
sleeve onto the chassis mount running the wires for the meter out the back. Fill the opening with RTV silicone as shown.




Now all you have to do is plug one end into the Minelab, the other connects to the coil plug, and connect to the meter.
For questions or comments you can contact me here.
