I also add the psar value to the line:

 self.lines.PSAR = self.psar

I have defined the a psar indicator using the talib library. I am using talib as I want to use the value of an indicator for my feed instead of the default close price.

lines = ('psar',)
plotlines = dict(
            psar=dict(
                _name='psar', marker='.', markersize=4.0, color='black', fillstyle='full', ls=''
            ),
        )

 self.psar = bt.talib.SAR(
            self.rl, 
            self.rl, 
            acceleration=0.02, maximum=0.12,
            plotname='PSAR',
        )

but when I view the chart the values defined in the plotlines dict don't assign to the indicator. I get the default values from the talib module.

I also tried to use: self.psar.plotlines = plotlines but this also did not take. I have been through the plotting docs but could not work this out.