1972 cst k5 fuel gauge prob

[brodykelly]

i recently purchased a 72 cst K5 air,tilt, all original body panels with no rust, any way i'm new here and was wondering if anyone has had this problem, my gas guage reads 1/4 tank when full, the guy i got it from said he installed new sending unit from lmc and the new one did the same thing so lmc sent him another one and it also does it, he gave me the 1st new sending unit and the 2nd new one is in it, and the box even says 69-72 blazer sending unit on it. it's not that big of a deal but when you put 35 dollars in gas in it and you drive away and it reads 1/4 it just sucks, any ideas out there maybe guage or ckt bd any suggestions greatly appreciated. thanks brody p.