They have placed a 3 axis stabilization system on the T-84 as part of a marketing tool, they will even give you one with a L-44 if you want it.Sources please,AFAIK the Warefare.ru ,globalsecurity,wiki and all say only 2 axis stabilisation using 2E42M armament stabilizer.and this from the manufacturer of T-80 series (Kharkiv Morozov) here while the T-90s uses the newer 2E42-4 Zhasmin stabilizer.Also Konkat-5 is not a part of T-80UD or T-84 (Russinas had stopped all the aid to Ukraine in wake of latter's deal with Pakistan).
T-90 overheating issues were only pertaing to the malfunctioning ESSA TI (Thales) (most probably due to absence of AC which is not the case for western tanks).The problem is said to have been sorted out.M1 being a GT is a sheer gas guzzler and does not suit IA tank doctrine (something which T-90M too had encountered when was brought to Thar for field trials).
Why would Ukraine not have the resources to place Konkat - 5 era, they can very easily manufacture it just like Russia, they can probably even manufacture kaKtus era also, the information was let out a long time ago.
At what positions on the T-90S does the stabilization system draw it`s information from when entering the ballistic computer.
You do not need to take anything I say to heart, this was part of my job within the U.S Army.
The gas guzzler deal is very correct, it takes 5 gallons of fuel just to get the engine to turn over.
Question for you in regards to T-90S that India is using - at what range do they conduct a precision boresight from, this is the alignment of all tank sights.
Also are they using DU type KE penetrators on the T-90S.