The group (1) is the inclusion of FG 1250.
Group (8) switch off the headlight)
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Projects E 50 and E 75 were planned as "standard tanks". They had to have the same engines, fuel tanks, cooling system, driving and steering wheels, a mechanism for pulling caterpillars, as well as the same shape and dimensions, but due to the less strong reservation at E 50, the internal volume was larger. All this made it possible to achieve a high degree of unification of machines. It is worth noting that the design work on these projects by the end of World War II was far from complete, complete sets of drawings were not prepared, let alone prototypes. The case was limited to carrying out calculations, a series of tests and creating various models and stands.
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https://ru.wikipedia.org/wiki/E-%D1%81%D0%B5%D1%80%D0%B8%D1%8F