Unit 086 Achzarit. As far as I know and Hebrew wikipedia supports me on this, the vehicles were put into actual service in 1988. At the least they were produced that year and entered service 1989. In addition there are actually two marks of the Achzarit, and several rounds of improvements in between...
The Mk 2 has a stronger engine and other internal improvements. Some also have a protected commanders "aquarium" and remote weapon system with 0.5 M2HB. The Mk 2 started production in 2010 and AFAIK all Achzarit were to be upgraded. That said in 2014 I still saw operational Mk 1 during my service in the war. For simplicity I suggest splitting to two units:
Unit 086 Achzarit: change start date 1/1989
Create a new unit named Achzarit Mk 2, it should be based on 086 but have: higher speed (maybe 15?), weapon slot 1 changed to weapon 055 M2HB AAMG. Vision,Fire control, LRF and stabilizer identical to unit 087 as it uses the same "Katlanit" RWS. Icon could probably do with a slight change to reflect the different look. Start date 1/2011 end date 2025.
Pictures for reference:
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Also there possibly is an issue of the vision stats for the Namer which I have just noticed. AFAIK the night sight clearly visible in the images is a Thermal Imaging sight. Vision for the Namer units and any others with the Katlanit should reflect this...