When you suspect an engine sender is not reading correctly, the steps to correct the problem are as follows:

STEP 1: CHECK GROUNDING TO ENGINE BLOCK

95% of all engine sender reading trouble is cause by insufficient Reference Ground to Engine Block. Please read this article for more on this.

STEP 2: CHECK WIRING AND CONNECTIONS

Often reverse polarity or incorrect wiring is the cause of misreading engine senders.

STEP 3: CHECK SETTINGS

Since many of these instruments are setup to connect to a wide variety of senders, it is important to make sure the setups are correct. Incorrect settings will result in incorrect readings.

Select the sender you are having trouble with here:

• RPM (Tach)
• Lycoming Engine using UMA Bendix or Sling mag hall effect tach sensors
  
• Oil Temperature:
• Westach Oil Temp Sender
• Oil Pressure:
• Oil Pressure VDO 145 PSI (10 Bar) Sender
• Rotax 4-20mA Oil Pressure Sender
  
• Coolant Temp (Water)
• Fuel Pressure:
• UMA Fuel Pressure Sender
• CHT:
• CHT Thermocouples
  
• EGT:
• EGT Thermocouples