diff --git a/overlay/etc/udev/rules.d/79-et-generic-remove.rules b/overlay/etc/udev/rules.d/75-et-generic-remove.rules
similarity index 100%
rename from overlay/etc/udev/rules.d/79-et-generic-remove.rules
rename to overlay/etc/udev/rules.d/75-et-generic-remove.rules
diff --git a/overlay/etc/udev/rules.d/79-et-digirig-dr891.rules b/overlay/etc/udev/rules.d/79-et-digirig-dr891.rules
new file mode 100644
index 0000000..57ca857
--- /dev/null
+++ b/overlay/etc/udev/rules.d/79-et-digirig-dr891.rules
@@ -0,0 +1,36 @@
+# Author   : Gaston Gonzalez
+# Date     : 11 November 2024
+# Purpose  : udev rules for the Yaesu FT-891 via the DigiRig DR-891
+#
+# Preconditions:
+# 1. Yaesu FT-891 is selected via et-radio
+# 2. Yaesu FT-891 is connected via DR-891 USB cable
+#
+# Postconditions:
+# 1. /dev/et-cat created
+# 2. /dev/et-audio created
+# 3. rigctld is started
+# 
+
+# Ensure that the FT-891 is set as the current radio configuration.
+# If it is, set ET_DEVICE=FT-891 to allow following rules to match.
+SUBSYSTEM=="tty|sound", PROGRAM="/opt/emcomm-tools/sbin/udev-tester.sh yaesu-ft891", \
+    ENV{ET_DEVICE}="FT-891"
+
+# CAT control device will only match if PROGRAM above matches (exit status=0)
+#SUBSYSTEM=="tty", ENV{ET_DEVICE}=="FT-891", \
+#    ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea70",\
+#    ACTION=="add", \
+#    ENV{ET_SUBDEVICE}="CAT", GROUP="dialout", MODE="0660", SYMLINK+="et-cat", \
+#    RUN+="/usr/bin/systemctl start rigctld"
+
+SUBSYSTEMS=="usb", ENV{ET_DEVICE}=="FT-891", ATTRS{bInterfaceProtocol}=="00", \
+    ACTION=="add", \
+    ENV{ET_SUBDEVICE}="CAT", GROUP="dialout", MODE="0660", SYMLINK+="et-cat", \
+    RUN+="/usr/bin/systemctl start rigctld"
+
+# Audio device will only match if PROGRAM above matches (exit status=0)
+SUBSYSTEM=="sound", ENV{ET_DEVICE}=="FT-891", ATTRS{idVendor}=="0d8c", ATTRS{idProduct}=="0012", \
+    ACTION=="add", \
+    ATTR{id}="ET_AUDIO", \
+    ENV{ET_SUBDEVICE}="AUDIO", GROUP="audio", MODE="0660", SYMLINK+="et-audio"
diff --git a/overlay/opt/emcomm-tools/conf/radios.d/yaesu-ft891.json b/overlay/opt/emcomm-tools/conf/radios.d/yaesu-ft891.json
new file mode 100644
index 0000000..b6edeff
--- /dev/null
+++ b/overlay/opt/emcomm-tools/conf/radios.d/yaesu-ft891.json
@@ -0,0 +1,16 @@
+{
+  "id": "yaesu-ft891",
+  "vendor": "Yaesu",
+  "model": "FT-891 (DR-891)",
+  "rigctrl": {
+    "id": "1036",
+    "baud": "38400",
+    "ptt": "RTS"
+  },
+  "notes": [
+    "TODO"
+  ],
+  "fieldNotes": [
+    "TODO"
+  ]
+}
diff --git a/overlay/opt/emcomm-tools/sbin/udev-tester.sh b/overlay/opt/emcomm-tools/sbin/udev-tester.sh
new file mode 100755
index 0000000..781c92a
--- /dev/null
+++ b/overlay/opt/emcomm-tools/sbin/udev-tester.sh
@@ -0,0 +1,44 @@
+#!/bin/bash
+# Author  : Gaston Gonzalez
+# Date    : 11 October 2024
+# Purpose : Perform tests that can be used by the udev subsystem to aid
+#           in rule development. This is intended to by used with the PROGRAM
+#           directive inside of a udev rule.
+#
+# Exit Statuses:
+#  0   udev rule should match  
+#  1   udev rule should not match.
+
+ET_HOME=/opt/emcomm-tools
+ACTIVE_RADIO="${ET_HOME}/conf/radios.d/active-radio.json"
+
+# Exit with a 0 exit success if, and only if, the currently selected radio is
+# a Yaesu FT-891.
+test_yaesu_ft891() {
+  if [ -L "${ET_HOME}/conf/radios.d/active-radio.json" ]; then
+    ID=$(cat "${ET_HOME}/conf/radios.d/active-radio.json" | jq -r .id)
+
+    if [[ "$ID" == "yaesu-ft891" ]]; then
+      exit 0
+    fi
+  fi
+  
+  exit 1
+}
+
+usage() {
+  echo "usage: $(basename $0) <radio ID>"
+}
+
+if [ $# -ne 1 ]; then
+  usage
+  exit 1
+fi
+
+case $1 in
+  yaesu-ft891)
+    test_yaesu_ft891
+  ;;
+esac
+
+exit 1