diff --git a/src/proto_nd_flow/reco/charge/calib_prompt_hits.py b/src/proto_nd_flow/reco/charge/calib_prompt_hits.py
index 8781107f..153c1410 100644
--- a/src/proto_nd_flow/reco/charge/calib_prompt_hits.py
+++ b/src/proto_nd_flow/reco/charge/calib_prompt_hits.py
@@ -102,6 +102,11 @@ def __init__(self, **params):
         self.t0_dset_name = params.get('t0_dset_name')
         self.pedestal_file = params.get('pedestal_file', '')
         self.configuration_file = params.get('configuration_file', '')
+        self.pedestal_mv = params.get('pdestal_mv', 580.0)
+        self.vref_mv = params.get('vref_mv', 1568.0)
+        self.vcm_mv = params.get('vcm_mv', 478.1)
+        self.adc_counts = params.get('adc_counts', 256)
+        self.gain = params.get('gain', 4.522)
 
     def init(self, source_name):
         super(CalibHitBuilder, self).init(source_name)
@@ -211,12 +216,19 @@ def run(self, source_name, source_slice, cache):
                             + packets_arr['chip_id'].astype(int)) * 64 \
                 + packets_arr['channel_id'].astype(int)
             hit_uniqueid_str = hit_uniqueid.astype(str)
-            vref = np.array(
-                [self.configuration[unique_id]['vref_mv'] for unique_id in hit_uniqueid_str])
-            vcm = np.array([self.configuration[unique_id]['vcm_mv']
-                            for unique_id in hit_uniqueid_str])
-            ped = np.array([self.pedestal[unique_id]['pedestal_mv']
-                            for unique_id in hit_uniqueid_str])
+            if self.configuration_file != '':
+                vref = np.array(
+                    [self.configuration[unique_id]['vref_mv'] for unique_id in hit_uniqueid_str])
+                vcm = np.array([self.configuration[unique_id]['vcm_mv']
+                                for unique_id in hit_uniqueid_str])
+            else:
+                vref = np.full(len(hit_uniqueid_str), self.vref_mv)
+                vcm = np.full(len(hit_uniqueid_str), self.vcm_mv)
+            if self.pedestal_file != '':
+                ped = np.array([self.pedestal[unique_id]['pedestal_mv']
+                                for unique_id in hit_uniqueid_str])
+            else:
+                ped = np.full(len(hit_uniqueid_str), self.pedestal_mv)
             calib_hits_arr['id'] = calib_hits_slice.start + np.arange(n, dtype=int)
             calib_hits_arr['x'] = x
             if has_mc_truth:
@@ -227,7 +239,7 @@ def run(self, source_name, source_slice, cache):
             calib_hits_arr['t_drift'] = drift_t
             calib_hits_arr['io_group'] = packets_arr['io_group']
             calib_hits_arr['io_channel'] = packets_arr['io_channel']
-            hits_charge = self.charge_from_dataword(packets_arr['dataword'],vref,vcm,ped) # ke-
+            hits_charge = self.charge_from_dataword(packets_arr['dataword'], vref, vcm, ped, self.adc_counts, self.gain) # ke-
             calib_hits_arr['Q'] = hits_charge # ke-
             #FIXME supply more realistic dEdx in the recombination; also apply measured electron lifetime
             calib_hits_arr['E'] = hits_charge * (1000 * units.e) / resources['LArData'].ionization_recombination(mode=2,dEdx=2) * (resources['LArData'].ionization_w / units.MeV) # MeV
@@ -266,8 +278,8 @@ def run(self, source_name, source_slice, cache):
 
 
     @staticmethod
-    def charge_from_dataword(dw, vref, vcm, ped):
-        return (dw / 256. * (vref - vcm) + vcm - ped) / 4. # hardcoding 4 mV/ke- conv.
+    def charge_from_dataword(dw, vref, vcm, ped, adc_counts, gain):
+        return (dw / adc_counts * (vref - vcm) + vcm - ped) / gain
 
     def load_pedestals(self):
         if self.pedestal_file != '' and not resources['RunData'].is_mc:
diff --git a/yamls/proto_nd_flow/reco/charge/CalibHitBuilder.yaml b/yamls/proto_nd_flow/reco/charge/CalibHitBuilder.yaml
index 0521fd98..553c504e 100644
--- a/yamls/proto_nd_flow/reco/charge/CalibHitBuilder.yaml
+++ b/yamls/proto_nd_flow/reco/charge/CalibHitBuilder.yaml
@@ -32,3 +32,9 @@ params:
   # download link: https://portal.nersc.gov/project/dune/data/Module0/TPC1+2/configFiles/datalog_2021_04_02_19_00_46_CESTevd_ped.json
   #configuration_file: 'data/module0_flow/evd_config_21-03-31_12-36-13.json'
   # download link: https://portal.nersc.gov/project/dune/data/Module0/TPC1+2/configFiles/evd_config_21-03-31_12-36-13.json
+
+  pedestal_mv: 580.0
+  vref_mv: 1568.0 #M0-like: 1300 #2x2: 1568.0
+  vcm_mv: 478.1 #M0-like:288 #478.0 #2x2: 478.1
+  adc_counts: 256
+  gain: 4.522 #datasheet: 4 #measurement(?): 4.522