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The SS pipes from Stainless Works fit very nicely on
my '89 and plug access is not an issue.
Incidentally, you might want to plan to place some
heat shielding around the Fan Switch that threads
into the head on the driver's side (if you have the
aux fan). The heat from #1 pipe seems to cause
a false reading otherwise and you may find the fan
engaging at a lower temperature.
ThermoTech and DEI sell material that can be placed
over the wire and sensor.