The Tempest was shipped with a Type I MK III Beamont Modification gunsight. S/Ldr. R.P. Beamont commanded a Typhoon squadron. They found with the old MKIIL gunsight that the orange glow glare of the large ring and dot made it near impossible to see targets on the ground when making rocket runs. So Beamont taped off the ring leaving only the dot. This allowed the ability to see ground targets.
RAF material command created the type I MK III based on this for the Tempest with a ring to move the single dot reticle forward and back to account for rocket drop or 20mm centered at 250-300yds. This was projected on the inside of the windscreen for the best visibility.
The Tempest and later Typhoon at the end of the war were the only allied aircraft to be equipped with the "Dot of Death". The Type I MK III had no range and wingspan dials like you see in the Typhoon. Just an elevation adjustment Ring. If you have set your FoV to 106 then the dot will be very tiny. If you zoom in to make the width of the Tempest gunsight tan rectangular bumper 5 inches wide, then the dot will be a proper 6Mil in diameter or what you would see in real life.
I made all of these gunsights historically correct down to the Mil parameters from each military specs, then converted that to Hitech world Mil units of 2pixel = 1Mil. You are always free to put any gunsight you want in any plane.