I purchased a full set of these with the master display as well for my 1978 Phoenix. They do look superb.
I think they cost something like $190 for the master n 4 x slave displays from Mad Amusements cause I had a order in already and adding them didnt add any extra postage. The PinScore stuff is excellent.

I then found out that Beaky (Andy) makes his own pinscore type displays n buys the stuff from some electrical wholesaler n puts it together himself with soldering iron etc. I dont know exactly what he gets or does, but I saw some new ones he had made and they looked great. Talented.