OWC In-line Digital Thermal Sensor for Hard Drive Upgrade for 27'' imacs 2012 and Later. OWC DIY Kit for all Apple 27" iMac 2012 and later Models for replacing the main hard drive. Includes all cables necessary for installation. Hard drive and tools sold separately. Eliminate fan noise and maintain correct system fan control when upgrading your 2012 or later iMac. The only iMac HDD upgrade option on the market certified to pass the Apple Hardware Test. Fixes firmware incompatibility issues with third party hard drives. Engineered in-house and backed by OWC's award-winning customer support. Improve Performance and Capacity. Upgrade Your iMac with Confidence. OWC's in-line solution is the only hardware digital thermal sensor on the market allowing a third-party SATA drive to be installed in your iMac. A convenient, plug-and-play cable, the In-line Digital Thermal Sensor eliminates fan noise and maintains proper system fan control through the iMac's System Management Controller. This innovative device is designed specifically for the iMac, requires no software hacks and ensures compatibility with Apple's built-in diagnostic processes. Note: Before attempting to perform this installation, please watch the OWC Install Video, corresponding to your machine, in its entirety to determine your ability to perform this complex upgrade. Includes: OWC In-line Digital Thermal Sensor Cable, OWC Pick (for screen separation), OEM adhesive strips (for screen re-attachment). Compatible with 27 inch iMac (2012 Model ID: iMac13,2) (2013 Model ID: iMac14,2), 27 inch iMac with Retina 5K display (2014 Model ID: iMac15,1) (2015 Model ID: iMac15,1)(2015 Model ID: iMac17,1 )(2017 model ID: iMac18,3) and (2019 model ID: iMac19,1)