My own work around (no HUD)
cockpit.7z
[CockpitData]
Directory=cockpit
HUDMode=CAGED,AA,AG
RippleQuantity=1,2,4
RippleInterval=60,100,140
[GunsightFront]
HasGunsight=TRUE
GunsightMilSize=50
GunsightName=Meteor8_lead.tga
AGGunsightName=Meteor8_lead_AG
GunsightComputedName=Meteor8_sight.tga
LeadComputing=TRUE
MinLeadRange=182.88
MaxLeadRange=731.52
DefaultLeadRange=300
MaxDepression=250
DefaultDepression=50
RocketDepression=50
All functions are 100% historically accurate including the boresight cross in the air-to-air mode with the gyro sight enabled. It could be turned off and on by the pilot, he could even have the entire fixed (AG) sight (cross and circle) displayed as well as the gyro sight but most would just have the small cross from the fixed sight showing as well as the gyro sight. This was the same on WWII RAF gyro sights although most did not have the depressable function for the fixed sight at that stage.