In 1978 Merzario partnered with Swiss Formula One entrant Guglielmo Bellasi and laid the foundation for his own team. Merzario's first self-built Formula One effort, the A1, appeared in 1978 and was a basically conventional car based largely on his March 761B, with a red colour scheme and crude bodywork vaguely reminiscent of a Ferrari 312T2 in its use of cockpit-side ducting for an air intake. It used the then-common combination of the Cosworth DFV engine and Hewland gearbox. The livery changed from red to black before the 1978 Monaco Grand Prix, though it was not until the Swedish Grand Prix that it finished a race, although unclassified, being eight laps adrift of the winner after a long pitstop. For the Austrian Grand Prix, a second A1 was unveiled, although it was suspected that this was actually the team's old March 761B with new bodywork. With this car at his disposal, Merzario performed slightly better in qualifying but still failed to be classified in a race. For the Italian Grand Prix, both A1s were entered, with Alberto Colombo driving the original A1 and Merzario taking the newer second A1. Colombo posted the slowest time during qualifying and did not make the grid, while Merzario qualified comfortably, only for the engine to fail during the race. The team qualified the car on eight occasions during 1978, but retired seven times with mechanical failures.