Not all sending units are 30 ohms, the one in the tank on my 68 shortbed is 90 ohms. Many of the suppliers list diffrent sending units for inline 6's and V8's not sure why??? May be a guage diffrence ?? A fuel guage is just a variable Resistor. with a float arm. About as simple as it gets.

"If it ain't Steel it ain't Real"
"Earth the insane aslyum for the rest of the Universe"
41 1/2-ton, a work in progress
68 Shortbed stepside 327/325hp/700R4