Distributor modulator valve switch (?) [E4TZ-12A182-B / SW-1933] - NOS

https://www.ebay.com/itm/274862098613?hash=item3fff0ec8b5&_trkparms=ispr%3D1&amdata=enc%3AAQAGAAADEFB8g4GMUUU9FXn0adodAkurPFfnjmWq6nCPl95zWdy9A98jNIwDZ0LqrP8IbA5NiI1yqx9hdBQaNeqHlcfv5nvjs27sEyGdxbU91yqySp0U5yS7EIvDQIqtcNiFj3P5D48d%252Bxs00JD6W1JID2ivlaAdLvkju7rxzKpYF13z%252FxOriEYlXwkx1JIrV0VpKhAWwOOMHfBFrtYBt6bE9%252BHcUknFhHD%252Fu5FV0n8c8jgLv79VBg%252BHzdyeLt5li6OXXDejeax%252FHjx0f8I74P%252BUoFZU0ey0yqNxD5a4%252Fdw%252Fk5r2ndSyPKlrSjzshq1hYktJfQzz%252FR9XN81%252BkbJAf2h%252FKIuKQKE4N3xNxbcrL3PLZDZKAxOl0%252BN1LWsLmvntzn4AtgUO2%252FBlOO%252FenzynGmIppBJKfe%252Bs2fjCNp6ECiT4HGBNiZAXTsmHug3IhVnXcmaCFztwtKwg%252FkI9GeFACQMnJNHo2Q0GtS5Q4xmFc7%252BqmWojCjGPqklfin0b%252B3kZzws78tttuZSULfopTzC%252F6tkl0ge8EPsqUiBSmGJi%252Bg7kx18MAbZFGYkbPZuc%252BmGFm3L34iphZ88XXRKoYkbe72vJT6ZIoJbNyhB5xBBIqf7NtlRogmUY%252BOkBwHXM9PrYJH0UCwSPj2F%252B%252BbiIgcAf5HtClJ82uWaZ0nxc3Yw8Rd5wdXTYAEH4KfXe2p2gzs6Qsz74O1GyaXtKnQ%252BHQO9oFgpiIqKMKoXYqSMOtyiINYR9lE9r4YTHC0KeWs9%252Btg9cxVChE1k4K9wKxZy5wy%252FegMgmJsyeJun35VSZx1cOJz%252BxxTz3wYfCKyUReYJ3CQNJIy7BTNCcuBki9EpXvBt9R3640Q%252F6WozyPOzjy7BqTePzUJ22VgJGfkW6Z1mYnr%252FeQcNT9SzIV4XbpDSk2vkEmdwrRqZ3nlHnMHP5qoG%252FDartFw6cTq%252BdlVW86GFG0sddLAM%252FuFD8UAHs2jhuUTXiLnk%252B04Sp135rrdajT%252FqdpWnxPSL7%252BsjaLgTj%252F5NFGqIMyM3f8lAfnh%252FfE3Xu2LO%252BdfBnswTLsBc%253D%7Campid%3APL_CLK

Shown in the parts lists for various calibration codes.  Shows as:

E4TZ 12A182-B Switch assy, (distributor modulator valve)— 1985
*SW-1933 #E4TE 12A182-B1A.B2A
Vehicle line: F Series, Econoline & U150

One example is:

CALIBRATION PARTS LIST NO. 418
(Calibration No. 4-64Z-R10J-8 Cyl. 351 C.I.D. (5.8L)
1984/ E150 - - C6 w/Hi—altitude carb.
1984/ E250(89) - - C6 w/Hi-altitude carb.
1984/ F150/250 — C6 w/Hi-altitude carb.
1984/ U150 — C6 w/Hi-altitude carb

Thank you, Gary!