Interesting info guys, looks like you guys are or at least should be writing the books of facts.
To clear or up simplify things for me I will ask this, here is what I am doing just for clarification.
I have a 1970 W and I plan to use a set of 1986 Ford 351 W water and temp sensor, I do believe that they originally went in the same place on the block and intake manifold and it should be a direct exchange.
I plan to match these sensors up with a set of gauges, water temp, oil pressure, amp and fuel tank with gauges from the same 1986 F-150.
I see on the reverse side of all of these ( approx ) 81-86 gauges a small aluminum box that is hardwired ( for lack of a better term ) into the printed circuit tape. I am assuming this may be the box that you guys are referring to.
I do not ( unless I am missing something still ) know much about messing around with Ohms or measuring any sort of electrical impulses so I am assuming that if I get all of the original items back in the line and within the correct order I should not have too?
All of these gauges have two prongs coming off the rear, one for the power and one for the feed from the sensor.
Any idea on which wire and which gauge has to have this little box included within its system so that everything works properly?
I will need to figure out how the heck to use this little box since as mentioned it does not have any sort of prongs to attach anything too.
Thanks for the clarification, I am VERY close to finally driving this thing and these gauges are a big part of that.