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The flasher unit is integral to the switch.
The turn signal flasher relay switch, on a Peterbilt 379, is located under the dashboard. The relay simply plugs in.
Year? Condition? Features? Mileage? Need to know these things in order to assess the value. You won't find a brand new one - the 379 was taken out of production after the 2007 model year.
Behind the dash bezel.
Depends on temperature and relative humidity. I'd recommend you do a search for an 'R134a pressure/temperature chart'
Sunset Beach - 1997 1-379 was released on: USA: 13 July 1998
7.5% of 379= 7.5% * 379= 0.075 * 379= 28.425
35% of 379= 0.35 x 379 = 132.65
379 = 37,900%
379
624-379 = 245
1 and 379