Frenchman Gasly said driving the car “exceeded all my expectations”.
The 28-year-old said: “It was so emotional. I had never before been in a racing car older than me and the purity of the driving was incredible – just three pedals and a simple steering wheel, quite unlike what I’m used to in a modern F1 car.
“It was a once-in-a-lifetime episode that I will never forget. Very, very special.”
The drive, which took place earlier in the year, will feature in a tribute to Senna being aired by Sky over the Grand Prix weekend.
Gasly will also be wearing a Senna-inspired helmet with the support of the Senna family during the race.
The Toleman car will also be on display during the Silverstone Festival between 23 and 25 August.