Heres the deal on the KG102A , as far as install with the Sandel , it uses 7 wires as compared to the KCS55a system , it is a breeze to install , as long as it does not have a gold gyro can , it can be serviced.....If it is post serial # 34951 , it is a Mod 7 power supply and will probably last forever...... The Sandel units will backup the gyro by averaging the flux info into a simulated gyro presentation , hence if you lose the gyro , you are still good .... The problem with the Sandel install in the panel is that when you pull back the yokeshaft it raises about an inch in an upward arc near the bottom of the lowest hole (The HSI hole) , I compensated for this by shimming the lower mounting holes with flat washers between the panel and the instrument.....this tilted the back of the instrument upward and cleared the yokeshaft , BUT it caused clearance issues between the HSI and the horizon....Its doable , but challenging , And if you have ever flown with a Sandel , It is FANTASTIC!!!!!