diff --git a/piker/ui/_display.py b/piker/ui/_display.py
index c2dd0801..9f27cf7d 100644
--- a/piker/ui/_display.py
+++ b/piker/ui/_display.py
@@ -90,7 +90,6 @@ log = get_logger(__name__)
 def chart_maxmin(
     chart: ChartPlotWidget,
     fqsn: str,
-    # ohlcv_shm: ShmArray,
     vlm_chart: ChartPlotWidget | None = None,
 
 ) -> tuple[
@@ -106,13 +105,18 @@ def chart_maxmin(
 
     '''
     main_viz = chart.get_viz(chart.name)
-    last_bars_range = main_viz.bars_range()
-    out = chart.maxmin(name=fqsn)
+    out = main_viz.maxmin()
 
     if out is None:
-        return (last_bars_range, 0, 0, 0)
+        return (0, 0, 0)
 
-    mn, mx = out
+    (
+        ixrng,
+        read_slc,
+        mxmn,
+    ) = out
+
+    mn, mx = mxmn
 
     mx_vlm_in_view = 0
 
@@ -125,10 +129,9 @@ def chart_maxmin(
             _, mx_vlm_in_view = out
 
     return (
-        last_bars_range,
         mx,
         max(mn, 0),  # presuming price can't be negative?
-        mx_vlm_in_view,
+        mx_vlm_in_view,  # vlm max
     )
 
 
@@ -226,7 +229,7 @@ async def increment_history_view(
                 do_append
                 and liv
             ):
-                hist_viz.plot.vb._set_yrange()
+                hist_viz.plot.vb._set_yrange(viz=hist_viz)
 
             # check if tread-in-place x-shift is needed
             if should_tread:
@@ -313,9 +316,7 @@ async def graphics_update_loop(
             fqsn,
             vlm_chart,
         )
-        last_bars_range: tuple[float, float]
         (
-            last_bars_range,
             last_mx,
             last_mn,
             last_mx_vlm,
@@ -502,12 +503,11 @@ def graphics_update_cycle(
     # TODO: we should only run mxmn when we know
     # an update is due via ``do_append`` above.
     (
-        brange,
         mx_in_view,
         mn_in_view,
         mx_vlm_in_view,
     ) = ds.maxmin()
-    l, lbar, rbar, r = brange
+
     mx = mx_in_view + tick_margin
     mn = mn_in_view - tick_margin
     profiler('`ds.maxmin()` call')
@@ -524,14 +524,12 @@ def graphics_update_cycle(
     ):
         chart.update_graphics_from_flow(
             fqsn,
-            # chart.name,
             # do_append=do_append,
         )
         main_viz.draw_last(array_key=fqsn)
 
         hist_chart.update_graphics_from_flow(
             fqsn,
-            # chart.name,
             # do_append=do_append,
         )
 
@@ -546,7 +544,7 @@ def graphics_update_cycle(
         or trigger_all
     ):
         chart.increment_view(datums=append_diff)
-        main_viz.plot.vb._set_yrange()
+        main_viz.plot.vb._set_yrange(viz=main_viz)
 
         # NOTE: since vlm and ohlc charts are axis linked now we don't
         # need the double increment request?
@@ -696,7 +694,7 @@ def graphics_update_cycle(
             is_1m=True,
         )
         if hist_liv:
-            hist_viz.plot.vb._set_yrange()
+            hist_viz.plot.vb._set_yrange(viz=hist_viz)
 
     # XXX: update this every draw cycle to make
     varz['last_mx'], varz['last_mn'] = mx, mn
@@ -711,7 +709,6 @@ def graphics_update_cycle(
             and not viz.is_ohlc
         ):
             update_fsp_chart(
-                chart,
                 viz,
                 curve_name,
                 array_key=curve_name,
@@ -794,7 +791,6 @@ def graphics_update_cycle(
                 # and curve_name != fqsn
             ):
                 update_fsp_chart(
-                    vlm_chart,
                     viz,
                     curve_name,
                     array_key=curve_name,
@@ -806,7 +802,7 @@ def graphics_update_cycle(
                 # resizing from last quote?)
                 fvb = viz.plot.vb
                 fvb._set_yrange(
-                    name=curve_name,
+                    viz=viz,
                 )
 
             elif (
diff --git a/piker/ui/_fsp.py b/piker/ui/_fsp.py
index d5ffe7f8..5d2c50ef 100644
--- a/piker/ui/_fsp.py
+++ b/piker/ui/_fsp.py
@@ -78,7 +78,6 @@ def has_vlm(ohlcv: ShmArray) -> bool:
 
 
 def update_fsp_chart(
-    chart: ChartPlotWidget,
     viz,
     graphics_name: str,
     array_key: Optional[str],
@@ -101,18 +100,14 @@ def update_fsp_chart(
     # update graphics
     # NOTE: this does a length check internally which allows it
     # staying above the last row check below..
-    chart.update_graphics_from_flow(
-        graphics_name,
-        array_key=array_key or graphics_name,
-        **kwargs,
-    )
+    viz.update_graphics()
 
     # XXX: re: ``array_key``: fsp func names must be unique meaning we
     # can't have duplicates of the underlying data even if multiple
     # sub-charts reference it under different 'named charts'.
 
     # read from last calculated value and update any label
-    last_val_sticky = chart.plotItem.getAxis(
+    last_val_sticky = viz.plot.getAxis(
         'right')._stickies.get(graphics_name)
     if last_val_sticky:
         last = last_row[array_key]
diff --git a/piker/ui/_interaction.py b/piker/ui/_interaction.py
index e19887da..2e355edc 100644
--- a/piker/ui/_interaction.py
+++ b/piker/ui/_interaction.py
@@ -45,6 +45,7 @@ from . import _event
 
 if TYPE_CHECKING:
     from ._chart import ChartPlotWidget
+    from ._dataviz import Viz
 
 
 log = get_logger(__name__)
@@ -728,6 +729,7 @@ class ChartView(ViewBox):
         *,
 
         yrange: Optional[tuple[float, float]] = None,
+        viz: Viz | None = None,
 
         # NOTE: this value pairs (more or less) with L1 label text
         # height offset from from the bid/ask lines.