This is not a replacement for ET. It's a replacement for 7 former separate analogue tools in one small package. It replaces: -
8T-1000 Position Indicator Group
discontinued 8T-2700 Blowby/Air Flow Indicator Group
discontinued 8T-5200 Signal Generator/Counter Group
8T-5300 Engine Timing Indicator Group
9U-7400, 9U-7401, and 9U-7402 Multitach II,
4C-6500 Digital Thermometer
Fuel Flow Monitor