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Just use a K-type thermocouple and reader.
Some DVOMs can read thermocouple leads.
I use thermocouple thermometers from Extech and Tenma.
Both the air temp sensors and water temp sensors I use are resistors that measure in Ohms, not volts. The scangauge will get the air temp from either the MAF or an air temp sensor. Some vehicles do not measure the air temp.
You could also use the $9 in/out digital home thermometers and run the outside sensor end into your air-box.
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