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Buy separately. Hewitt Industries has high quality pyro instruments.
The boost gauge can be as simple as an industrial pressure gauge (about 0-20 psi).
I got a 1973 Hewitt pyro on Ebay. NOS and had the IH in the center. Paid $20 for it and it has the military looking bezel ready for paint. Lauderdale Speedometer & Compass http://www.lspeedo.com/index.html is a huge Hewitt (and any other gauge) dealer and had the thermocoupler and lead in stock. They checked my gauge for me too. Spent $47 for the lead and coupler. I've got less than $70 in the whole thing.