Hi jochen....
Great to be flying (tanking) with you post our WB experiences.........

Anyway, to answer your question about the Centurion. My memories of Centurions are more vague as I spent far less time in them as opposed to the M4A2E8 (76mm) Sherman. It did have the British 105 gun, which had just been upgraded in the summer of 1963, from the 84mm (20 pounder) master weapon system. The 105 was incredibly potent when engaging targets at longer ranges than the Sherman. Yes, the gun was stabilized and we also had infrared night vision aids.
I wanted to clear something else up in general. As I pointed out in an earlier message pertaining to gyroscopic stabilization for firing the master weapon on the move, this was NOT as post WWII innovation. In a similar vain, infrared was also used in WWII, particularly on German equipment. I have plagiarized some material from George Parada acknowledging full credit here for his research as follows:
"German Infrared Night-Vision Devices - Infrarot-Scheinwerfer
In 1936, AEG was ordered to start the development of infrared night-vision devices and in 1939, first successful prototype unit for use with 37mm Pak 35/36 L/45 anti-tank gun was constructed. In autumn of 1942, unit for use with 75mm PaK 40 L/46 anti-tank gun was constucted and was also mounted on Marder II (Sd.Kfz.131).
In mid 1943, first tests with infrared night-vision (Nacht Jager) devices and telescopic rangefinders mounted on Panther started. Two different arrangements / solutions were created and used on Panther tanks.
Solution A - Sperber (Sparrow Hawk) was made up of one 30cm infrared searchlight (with range of 600m) and image converter operated by the commander - FG 1250. From late 1944 to March of 1945, some Panzerkampfwagen V Panther Ausf G (and other variants) mounted with FG 1250, were succesfully tested. From March to April of 1945, approximately 50 Panthers Ausf G (and other variants) mounted with FG 1250, saw combat service on the Eastern Front and Western Front. Panthers with IR operated with SdKfz.251/20 Uhu (Owl) half-track with 60cm infra-red searchlight and Sd.Kfz.251/21 Falke (Falcon). This solution could be easily mounted on any type of armored fighting vehicle.
Solution B - Second more complicated arrangement / solution was "Biwa" (Bildwandler), which provided driver, gunner and commander with one 30cm infrared searchlight (with range of 600m) and image converter. Various variants of Panthers were converted and mounted with "Biwa". It was reported that tests were successful, but there is very few combat reports from the Eastern or Western Front.
Various units received IR Panthers including 116th Panzer Division (3rd company of 24th Panzer Regiment, Western Front, Summer of 1944), Sixth SS Panzer Army (Hungary, early 1945), Panzer Division Muncheberg and Clausewitz. One combat report is by a veteran of 1st SS Panzer Regiment of 1st SS Panzer Division "LSSAH", who states that few Panthers equipped with infrared night-vision devices possibly from 116th Panzer Division were used in 1944/45 during the Ardennes Offensive. In April of 1945, Panthers equipped with IR equipment (solution B) joined Panzer Division Clausewitz and in mid April near Uelzen destroyed entire platoon of British Comet cruiser tanks. Also on April 21st of 1945, same Panthers overran an American anti-tank position on the Weser-Elbe Canal.
In addition, it is reported that single unit equipped with Jagdpanthers also received and used infrared night-vision devices.
Crews of infrared night-vision devices mounted vehicles were also armed with MP44 assault rifles fitted with infrared night-vision device - Vampir (Vampire)."