I have a 1975 Mustang Ghia that has a 302 engine. Has anyone put in an after market fuel sending unit? I replaced my fuel tank and sending unit with a Spectra fuel tank and sending unit. The fuel gauge is the original and worked properly with my original equipment. Has anyone found their Spectra fuel sending units faulty. I don't believe mine was tested before it was installed to see if the resistant measurements were within spec.