MSD makes one. It does not wire into the EEC, but has a driver visual readout and audio warning. It is sensitivity adjustable and instructions are included to set it to your engine. The sensor installs in the coolant passgeway on the driver side rear of the block. There is a pipe plug in the hole from the factory. I am running a 6BTM with the Vortech, so if I am getting a higher reading than I am comfortable with due to high outside temps, low quality gas, etc.. I can take out a little more timing under boost. About $125 from Summit, if memory serves.
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