I went through this one year ago...I bought the 3/8" after market sending unit. Reads fine OUT of the tank...but IN the tank the most the gauge shows is 1/2 full. I bent it every which way. I finally gave up. I bought the marine float adjustment from AutoMeter. Bought the matching fuel level gauge...Even though my gauge cluster was repaired perfectly (and I mean perfectly to the extent of paying close to a grand to restore). I have a functioning fuel gauge again as I retrofitted the faulty Chinese sending unit with the Autometer version. Works great now...I hid my extra gauge in the glove box as it's something you rarely look at