Left turn at maxwight >= 7.5t

How do I map a left turn restriction which is only for vehicles heavier than 7.5t?

restriction:conditional=no_left_turn @ weight > 7.5

Assuming you mean t as in tonne, otherwise you’ll have to add a unit.

See Conditional restrictions - OpenStreetMap Wiki

Just to note that a weight-based turn restriction is likely to be a proxy for “large vehicle” rather than actual vehicle weight, i.e. maxweightrating:hgv wiki.

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Depending on the region, a conditional turn restriction sign might actually indicate an access restriction on the cross street. (The idea is to inform the driver as soon as possible before turning onto the street.) In that case, you could tag the cross street with maxweight:hgv=* or maxweightrating:hgv=* as appropriate.