>In any case, although it's true there was a change at some point, it had
>nothing to do with earth polarity. The early gauges will work just fine
>with negative earth (my TR3A has been negative ground for some 15 years),
>the later ones will work just fine with positive earth. The later type were
>cheaper to build ...
Are they cheaper to build? I've known for many years either
gauge/sender combo will work just fine with either polarity. But I
learned that the gauge needs to be matched with the sender winding
direction. I figured there must have been an obscure engineering reason
for changing the polarity of the windings with the polarity of the
battery. It never occured to me that the change was to keep build prices
down.
Back in the mid-80's when I went to add additional fuel gauges to my Land
Rover after adding two additional fuel tanks I discovered MGB fuel gauges
from positive earth MGBs worked fine with Land Rover positive earth fuel
sending units (up through '66) and negative earth MGB fuel gauges worked
just fine with Land Rover negative earth fuel sender units ('67 and newer
plus the Lucas universal replacment unit). Later I discovered that TR3
fuel gauges worked with positive earth Land Rover fuel sending units.
TeriAnn Wakeman If you send me direct mail, please
Santa Cruz, California start the subject line with TW -
twakeman@cruzers.com I will be sure to read the message
http://www.cruzers.com/~twakeman
"How can life grant us the boon of living..unless we dare"
Amelia Earhart 1898-1937
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