Eagle Accura 240 Installation And Operation Instructions Manual page 6

(Note: Do not use these sensors in any other combination.)
ST-TBK = 1 speed sensor and 1 temperature display
ST-T BK + TS-2BK = 2 temp sensors and one speed sensor
ST-TBK + TS-2BK + TS-3BK = 3 temp sensors and one speed sensor
TS-1BK = 1 temperature sensor
TS-12BK = 2 temperature sensors
or
TS-1BK + TS-2BK = 2 temperature sensors
TS-12BK + TS-3BK = 3 temperature sensors
or
TS-1BK + TS-2BK +TS-3BK = 3 temperature sensors
Here's some sample wiring diagrams:
Two Temperature Sensors
(Water and T-2)
Sensor Chart
TS-12 BK
Accura 240
POWER CABLE
4