O'Keeffe's Guilietta, run by Ashley Seward Motorsport, will sport green, white and red hues, symbolic of the Italian national flag, on the car's bonnet, roof and side skirts.
The Super2 driver tested the car for the first time at Winton last Monday.
“Compared to the Porsches and Supercar I've raced previously, the TCR car has three main differences,” said O'Keeffe.
“Firstly, it's front-wheel-drive, which is the most obvious factor. It changes the way you balance the car on the throttle.
“Also, there's no weight over the rear of the car, which means it takes time to get the rear tyres up to temperature – I think this will create some interesting moments in the early laps of races.
“The other big difference is the power delivery – the turbocharged engine isn't as linear as a naturally aspirated car.
“It took me a couple of sessions to get used to at Winton, but by the end of the day I felt comfortable, and was doing some good times.”
Meanwhile, the sister Garry Rogers Motorsport acquired Alfa Romeo of Vernon has opted for a similar look with red and green stripes down the flanks of a largely white colour scheme.
The cars will form part of a confirmed 16 car grid for the TCR Australia Series opener at Sydney Motorsport Park this weekend.