I'm kinda surprised to find an original owner of one of these so quickly!
So that explains Spacekom name. Any clue why the patent holder in CA made you talk to a guy in MI about the tech stuff?
Am I correct in thinking they were an aftermarket thing, or did they get in with anybody as an OEM option?
So far all I've found is a couple references on some Ford truck forums, some people saying "Me too" about having had FE instruments, and some expired ebay hits.
I'm kinda half tempted to try sending something to the contact numbers and addresses just to see if I can get any extra info, though they're probably dead-ends by now that'll have no clue what I'm talking about.