or a low coolant alarm
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Grover98
I'd suggest getting both the pyrometer and the low coolant alarm. The low coolant alarm is like having insurance for coolant loss, nice piece of mind :). The pyrometer will allow you to fine tune the diesel pump to unlock the most of the 300tdi (BUT adhere to the tuning notes that are available somewhere on this site, go too far and you could be up for a new motor :().