The FA1G was an evolution of the 1984 Osella FA1F, both designed by Guiseppe Petrotta. It differed from its predecessor primarily through a number of technical modifications – the extended wheelbase, redesigned radiators and rear diffuser. The FA1G used the 1.5-litre eight-cylinder turbo engine from Alfa Romeo (the Tipo 890). The car was ready for the third round of the 1985 Championship, San Marino Grand Prix. Piercarlo Ghinzani who raced for Osella since 1981, drove FA1G in five next rounds, finishing only once in the French Grand Prix. In the latter half of that year he was drafted into the Toleman team to partner fellow Italian Teo Fabi, and his seat in Osella was taken by Dutch Huub Rothengatter. His best result of the season was 7th place in the final race of the year, Australian Grand Prix. The FA1G was used also in 1986 and in part of the 1987 seasons of Formula 1.
| Season | Series | Event |
| 1985 | F1WC | Monaco GP |
| Driver | No. | Entrant |
| Piercarlo Ghinzani | 24 | Osella Squadra Corse |
| Scale | Manufacturer | Collection |
| 1:43 | Tameo Kits | |
| Cat. No. | Quality | Rarity |
| TMK48 | 
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