intermitant fuel gage

[rod donner]

I have a 1973 P337 the right fuel gage is very intermitant.I have been fighting this problem for a long time . I have done the following.Checked all conections,replaced controller,replaced right gage, with old gage I got some indication sometime ,but with new gage I get no indication at all.I have checked visually the circuit board but find no problems. Does anyone have any other Ideas?