Help with an Eagle Fish ID !!!

[Capt.Ron56]

I have an Eagle Fish ID that I have a project that i'm working on.What I need to know is which pin on the back of the unit where the power plug goes in ,is the positive pin? Would it be the pin by the tab so the plug can only go on one way? or is it the other pin thats all by itself?In other words,is the pos.pin at 2 oclock or 7 oclock looking at the back of the unit at the plug terminal.I have tried to find a replacement male power plug,a wiring diagram,etc and can't find any info anywhere.I'm planning on using 2 16 ga.crimp connectors,but I really don't feel like frying the unit.ANY info would be GREATLY apprieciated.Thank you guys for an awesome forum. Ron