You are so close to finishing now!
There's a whiteboard in the lab that shows you what color gascan each of the gasses will be.
You now have to search for two clipboards. (They spawn randomly, sometimes in the lab, sometimes you have to search about the house.)
One clipboard shows us what gascan we have to use, in our case, it is Helium.
Now we go back to the table and there we can read that Helium is a green can.
So our engine must have a green gascan.
The second clipboard shows us how many cables are going to the Hydrogen can.
The Hydrogen is ALWAYS
the colour blue
In our case the clipboard says 3x H. This means that we have to search for a Hydrogen can with three cables, the cables are random, so for instance, the clipboard could say 2x H, which would mean you would have to search for a Hydrogen can with two cables.
Okey, we already know that our engine must have a green gas can and a Hydrogen can with three cables. But we have to know what pressure our engine has.
You have to search for a computer in the lab, on it shows the pressure in psi (pounds/square inch).
In our case it says <5812 psi. You now have to convert the psi into Bar, because we can only see Bar on the engine.
If you don't know how to calculate psi into Bar, let Google do the work for you ;)
5812 psi is ~ 400 Bar. <5812 psi means lesser than 5812 psi, so smaller than 400 Bar.
Our Engine must have a pressure smaller than 400 bar!
(This picture does not fit with the screen on this heist, it's from another heist)
We found the right engine! We know the color of the gas can, how many cables lead from the Hydrogen can and how much bar it has. There is only one engine which meets all the requirements.
Now bag the engine and go to the Airfield.