The panel/suburban tank is different, so the sender is different.
I've fixed several senders by putting a good resistor unit onto a
different sender assy...sometimes it takes some soldering to get the
"wire" the right length.
The newer senders (from the late 60s up) use a 90 ohm resistor, instead
of the older 30 ohm resistor, so they won't work.
You might want to get a new pickup sender and swap the resistor and
float onto your old sender...or just don't worry about it till it quits
working.
Jim F
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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