Ampmeter installation

I have a manual but the way my system is now is sorta not the same as what's in the manual.

I do not have a resistor in the electrical system, I do have a blue square box under the dash with (4)-terminals coming out of it (voltage regultor?). One goes to the armature, field, & the third to ground, the fourth is not used.

My question is what wires should be hooked up and from where?

Thank You for any help!

It is a "speciality device" incomprehensable to electrical neubies that changes resistance value from about 0.4-ohm to about 1.7-ohm, depending upon its internal temperature. It changes with operating time of about 2-minutes to about 1.4-ohms (nominal). It is Ford's tricky way to deal with 1939 "die-eazy" 6-volt batterys and COLD STARTING. That is why I call it "infamous" 'cuz nobody don't understand it.

As I said, it is mounted on backside of dashpanel underneath yer ampmeter that you can't seem to understand eather..... ...respectfully, Dell

WARNING: yer 6-volt squarecan frontmount ignition coil MUST HAVE the "infamous ballast resistor" (mounted on backside of dashpanel, underneath ampmeter) or you will be replacing yer ignition coil every couple of days. Why? Because the coil without the infamous ballast resistor will run TOO-HOTT and melt the insulative tars and you will develope "weak sparkies" and hard starting..... ...Dell, yer self-appointed sparkie-meister