Finally did the HDD to SSD upgrade in my 2010 iMac 27" - Pics inside - RedFlagDeals.com Forums
Installing additional SSD in Mid-2010 27" iMac
New Hard Drive Temperature Sensor Cable for Imac A1312 4 pins SSD Temperature Cable 27 inch 2009 2010 593 1033|Computer Cables & Connectors| - AliExpress
Amazon.com: OWC in-Line Digital Thermal Sensor HDD Upgrade Cable for iMac 2011, (OWCDIDIMACHDD11) : Electronics
OWC In-line Digital Thermal Sensor for Apple iMac 2011