I put one in my boss's '67 Firebird 'vert 4 years ago and it isn't too hard to read when the sun is right on it. There are three ohm settings for the fuel gauge (for his car anyways) and none of them gave an accurate reading on the low/empty side of the gauge . He has run out of gas 2-3 times because of it. But otherwise they have some pretty cool features built into them .