When Elta offered its EL/M-2052 AESA radar to India for its Jaguar fighter, it came with the condition that another fighter in service with IAF should field the radar. Thus the EL/M-2052 was also offered as an upgrade for the Tejas by HAL.
By SSGT Mathew Hannen, USAF, uploaded by User:Chanakyathegreat [Public domain], via Wikimedia Commons