diff --git a/device/testing/device-google-sargo/81-libssc-google-sargo.rules b/device/testing/device-google-sargo/81-libssc-google-sargo.rules
new file mode 100644
index 000000000..0665826f8
--- /dev/null
+++ b/device/testing/device-google-sargo/81-libssc-google-sargo.rules
@@ -0,0 +1,5 @@
+# Invert the acceleration so it is directed downwards, at rest on a planet.
+# This is for compatibility with iio-sensor-proxy.
+#
+# https://gitlab.freedesktop.org/hadess/iio-sensor-proxy/-/issues/375
+SUBSYSTEM=="misc", KERNEL=="fastrpc-adsp", ENV{ACCEL_MOUNT_MATRIX}="-1, 0, 0; 0, -1, 0; 0, 0, -1"
diff --git a/device/testing/device-google-sargo/APKBUILD b/device/testing/device-google-sargo/APKBUILD
index 524107641..da9cd6ba4 100644
--- a/device/testing/device-google-sargo/APKBUILD
+++ b/device/testing/device-google-sargo/APKBUILD
@@ -2,7 +2,7 @@
 # Maintainer: Richard Acayan <mailingradian@gmail.com>
 pkgname=device-google-sargo
 pkgdesc="Google Pixel 3a"
-pkgver=2
+pkgver=3
 pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
@@ -20,8 +20,10 @@ depends="
 makedepends="devicepkg-dev"
 source="
 	10-unl0kr-msm.conf
+	81-libssc-google-sargo.rules
 	90-feedbackd-drv2624.rules
 	deviceinfo
+	hexagonrpcd-adsp-sensorspd.confd
 	modules-initfs
 	q6voiced.conf
 "
@@ -42,24 +44,40 @@ package() {
 
 nonfree_firmware() {
 	pkgdesc="Proprietary firmware blobs for the Google Pixel 3a"
+	replaces="hexagonrpcd-openrc"
 	depends="
 		firmware-google-sargo
+		hexagonrpcd
 		linux-firmware-ath10k
 		linux-firmware-qca
 		linux-firmware-qcom
 		soc-qcom-sdm845-modem
 		soc-qcom-sdm845-nonfree-firmware
 	"
+	install="
+		device-google-sargo-nonfree-firmware.post-install
+		device-google-sargo-nonfree-firmware.post-upgrade
+	"
 
 	# The q6voiced configuration can only be used if the ADSP is brought up
 	# via non-free firmware.
 	install -Dm644 "$srcdir"/q6voiced.conf "$subpkgdir"/etc/conf.d/q6voiced
+
+	# Sensors depend on ADSP firmware and the sensors registry served over FastRPC.
+	install -Dm644 "$srcdir"/hexagonrpcd-adsp-sensorspd.confd \
+		"$subpkgdir"/etc/conf.d/hexagonrpcd-adsp-sensorspd
+
+	# Sensors depend on ADSP firmware and the sensors registry served over FastRPC.
+	install -Dm644 "$srcdir"/81-libssc-google-sargo.rules \
+		"$subpkgdir"/usr/lib/udev/rules.d/81-libssc-google-sargo.rules
 }
 
 sha512sums="
 f700af3145b79d1ef9edfb22982899b25cabfb212f9620dcbd3a2e6f44b5ad591e0a66056c6fcd66c3fde89a2b5f551e8a8fe2e65cf0e2a48adec57c027d7825  10-unl0kr-msm.conf
+7fae1bae706d4117aade2462dac9aaba0d70215f5280bac89c3810df1eb94883ffdce5f81ff9f0dc39d27d6e56ca5476456866cfbd5b6e3f3e6e9048b758c51f  81-libssc-google-sargo.rules
 016d398155f2344417f5e5649a361719ba6e53e593c501b5df39114cdd284302b9bf8686a39817aee0c08fec95b3ab613c181d6cc9596299aaf7fd05dbe0c3dd  90-feedbackd-drv2624.rules
 8af19da4e4a4a59c49263722065229fae849c3273af313300b7ea1b8fe008c6e55cfd060b91909306dd600134e2494f740adda245707dbcff84b1ab2f37dbde7  deviceinfo
+b6208c254b6e44ac4f6d748a38cc6b05da0db2c90235ada2011b138b82ccc3372687df2f5ad97e885e9eea135216a3c52266a08a7f4eb323e62e799f6f82ec7b  hexagonrpcd-adsp-sensorspd.confd
 9e2bd634e8f0104827991c5ce7b2346187310a6362f47a67d16e2bd93a910e8ec49f6b98608908febb7cecde14687af094bd95b8b3c1f8122d3710333ecf417e  modules-initfs
 7f599f086dba97ac39ce98798969bc8e9c26dd3b062bb8f95852182df52814b70d49b701e27b43abeb3639b16ba053e416c14cf75e0bf4a9f2fe7c01fb0ac41c  q6voiced.conf
 "
diff --git a/device/testing/device-google-sargo/device-google-sargo-nonfree-firmware.post-install b/device/testing/device-google-sargo/device-google-sargo-nonfree-firmware.post-install
new file mode 100644
index 000000000..0ab38f727
--- /dev/null
+++ b/device/testing/device-google-sargo/device-google-sargo-nonfree-firmware.post-install
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+rc-update add hexagonrpcd-adsp-sensorspd
diff --git a/device/testing/device-google-sargo/device-google-sargo-nonfree-firmware.post-upgrade b/device/testing/device-google-sargo/device-google-sargo-nonfree-firmware.post-upgrade
new file mode 120000
index 000000000..d04b21bc3
--- /dev/null
+++ b/device/testing/device-google-sargo/device-google-sargo-nonfree-firmware.post-upgrade
@@ -0,0 +1 @@
+device-google-sargo-nonfree-firmware.post-install
\ No newline at end of file
diff --git a/device/testing/device-google-sargo/hexagonrpcd-adsp-sensorspd.confd b/device/testing/device-google-sargo/hexagonrpcd-adsp-sensorspd.confd
new file mode 100644
index 000000000..c9d4bf763
--- /dev/null
+++ b/device/testing/device-google-sargo/hexagonrpcd-adsp-sensorspd.confd
@@ -0,0 +1,2 @@
+# HexagonFS root directory for served files.
+hexagonrpcd_fw_dir="/usr/share/qcom/sdm670/Google/sargo"