It's typically an OHM difference between your electric sender for the FiTech and your mechanical gauge elsewhere in your car. Sometimes they'll be completely off always. Othertimes they may be slow (in my case). My sender eventually reads within 1 degree of my mechanical guage, but it takes a couple minutes to catch up.
The best known sensor for accuracy with the FiTech is the AC Delco 213-928. It's about 30 bucks.
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-Jason
1969 Pontiac Firebird
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