First I want to make sure you have the same manual I am using, maybe in Europe something is different in the manual.

Follow this link for the latest manual:


http://www.jetcatusa.com/PDFFiles/In...nManualV4L.pdf


Now on to the questions

1.) If the temp is showing 50 and the ambient is 23, you can recalibrate the sensor using the procedure shown on page 28 of this manual.

To summarize the procedure:

Your engine should be at approximately room temperature, 21 °C.
Press and hold the Select Menu key on the GSU, then switch on the power (instead of pressing the Select Menu key on the GSU, the little key on the LED board can be use instead).

The Display of the GSU will also show the message:

Release key to: - learn RC -

Keep the Select Menu key pressed!. It takes up to 10 seconds!

The Display of the GSU will change to the message:
Release key to: Calibrate Temp
Now release the key. The display should return to the default showing RPM and temperature. The temperature should be 21 °C.

2.) Trouble with Manual Mode (see page 36)

The Manual mode is no longer implemented. Instead, a
new expanded set of test functions are available from the Test–Functions Menu. This menu is selected while pressing the Select Menu key, press the "-" or "+" key until the menu is displayed. To test the selected component, press the "Change Value/Item"
key. To change the fuel pump or glow plug voltage when testing, while pressing the "Change Value/Item key, press the "-" or "+" key. The following functions are available:

• Run the fuel pump with a programmable voltage. This is principally used to prime the fuel system.

• Test the glow plug and/or set the voltage.

• Test the starting gas valve.

• Test the smoker valve.

• Test the fuel valve.

• EGT offset information.


3.) Selection of Temp Value Units.

I don't see any reference to that in the manual, like I said maybe you have a different manual. As far as I know there is no selection for temp value units with the ECU.

Hope that helps