You have the option of using up to 2 temperature sensors with the Astro. You can choose between H20 (water), CHT (cylinder head), and EGT (exhaust gas).
If you have a water cooled motor the most widely used and important temperature sensor would be the H20. This sensor is a 10mm thread. Most TAG motors comes with a fitting in the head. If your motor does not you can purchase a Water Fitting
that you place in your radiator hose lines.
If you have an air cooled motor than you would want to use a CHT sensor. This sensor gets placed under the spark plug. It is 9/16 (14mm) in size.
An EGT sensor can be used with either water cooled or air cooled motors and gathers the air/fuel ratio. It can assist you in tuning the engine or jetting. This sensor will need to be isntalled in you exhaust pipe.
All of these sensors do require an extension cable
which is sold seperately.
These sensors are compatible with the Alfano Astro, Alfano Pro Plus, and the Alfano Pro V2. (these will not work with the older standard Alfano Pro)