diff --git a/dev-tools/omicron-dev/src/main.rs b/dev-tools/omicron-dev/src/main.rs
index fb62f1dd49f..267a3190051 100644
--- a/dev-tools/omicron-dev/src/main.rs
+++ b/dev-tools/omicron-dev/src/main.rs
@@ -12,6 +12,7 @@ use nexus_config::NexusConfig;
 use nexus_test_interface::NexusServer;
 use nexus_test_utils::resource_helpers::DiskTest;
 use signal_hook_tokio::Signals;
+use std::fs;
 
 fn main() -> anyhow::Result<()> {
     oxide_tokio_rt::run(async {
@@ -50,6 +51,9 @@ struct RunAllArgs {
     /// Override the gateway server configuration file.
     #[clap(long, default_value = DEFAULT_SP_SIM_CONFIG)]
     gateway_config: Utf8PathBuf,
+    /// Override the nexus configuration file.
+    #[clap(long, default_value = "./nexus/examples/config.toml")]
+    nexus_config: Utf8PathBuf,
 }
 
 impl RunAllArgs {
@@ -60,9 +64,10 @@ impl RunAllArgs {
         let mut signal_stream = signals.fuse();
 
         // Read configuration.
-        let config_str = include_str!("../../../nexus/examples/config.toml");
-        let mut config: NexusConfig =
-            toml::from_str(config_str).context("parsing example config")?;
+        let config_str = fs::read_to_string(&self.nexus_config)?;
+        let mut config: NexusConfig = toml::from_str(&config_str).context(
+            format!("parsing config: {}", self.nexus_config.as_str()),
+        )?;
         config.pkg.log = dropshot::ConfigLogging::File {
             // See LogContext::new(),
             path: "UNUSED".to_string().into(),
diff --git a/dev-tools/omicron-dev/tests/test-omicron-dev.rs b/dev-tools/omicron-dev/tests/test-omicron-dev.rs
index 816bf7d135a..3bd9a5a1f06 100644
--- a/dev-tools/omicron-dev/tests/test-omicron-dev.rs
+++ b/dev-tools/omicron-dev/tests/test-omicron-dev.rs
@@ -139,7 +139,7 @@ async fn test_run_all() {
     let cmd_path = path_to_omicron_dev();
 
     let cmdstr = format!(
-        "( set -o monitor; {} run-all --nexus-listen-port 0 && true )",
+        "( set -o monitor; {} run-all --nexus-listen-port 0 --nexus-config ../../nexus/examples/config.toml && true )",
         cmd_path.display()
     );
     let exec =
diff --git a/tools/install_builder_prerequisites.sh b/tools/install_builder_prerequisites.sh
index e7d9bfef5a2..486bf0b33da 100755
--- a/tools/install_builder_prerequisites.sh
+++ b/tools/install_builder_prerequisites.sh
@@ -31,12 +31,14 @@ function usage
 
 ASSUME_YES="false"
 SKIP_PATH_CHECK="false"
+OMIT_SUDO="false"
 RETRY_ATTEMPTS=3
-while getopts ypr: flag
+while getopts ypsr: flag
 do
   case "${flag}" in
     y) ASSUME_YES="true" ;;
     p) SKIP_PATH_CHECK="true" ;;
+    s) OMIT_SUDO="true" ;;
     r) RETRY_ATTEMPTS=${OPTARG} ;;
     *) usage
   esac
@@ -130,11 +132,16 @@ function install_packages {
       'libclang-dev'
       'libsqlite3-dev'
     )
-    sudo apt-get update
+    if [[ "${OMIT_SUDO}" == "false" ]]; then
+      maybe_sudo="sudo"
+    else
+      maybe_sudo=""
+    fi
+    $maybe_sudo apt-get update
     if [[ "${ASSUME_YES}" == "true" ]]; then
-        sudo apt-get install -y "${packages[@]}"
+        $maybe_sudo apt-get install -y "${packages[@]}"
     else
-        confirm "Install (or update) [${packages[*]}]?" && sudo apt-get install "${packages[@]}"
+        confirm "Install (or update) [${packages[*]}]?" && $maybe_sudo apt-get install "${packages[@]}"
     fi
   elif [[ "${HOST_OS}" == "SunOS" ]]; then
     CLANGVER=15
diff --git a/tools/install_runner_prerequisites.sh b/tools/install_runner_prerequisites.sh
index 120cbc3db84..c93f5cdb473 100755
--- a/tools/install_runner_prerequisites.sh
+++ b/tools/install_runner_prerequisites.sh
@@ -30,12 +30,14 @@ function usage
 }
 
 ASSUME_YES="false"
+OMIT_SUDO="false"
 RETRY_ATTEMPTS=3
-while getopts ypr: flag
+while getopts ypsr: flag
 do
   case "${flag}" in
     y) ASSUME_YES="true" ;;
     p) continue ;;
+    s) OMIT_SUDO="true" ;;
     r) RETRY_ATTEMPTS=${OPTARG} ;;
     *) usage
   esac
@@ -139,11 +141,16 @@ function install_packages {
       'libssl3'
       'libxmlsec1-openssl'
     )
-    sudo apt-get update
+    if [[ "${OMIT_SUDO}" == "false" ]]; then
+      maybe_sudo="sudo"
+    else
+      maybe_sudo=""
+    fi
+    $maybe_sudo apt-get update
     if [[ "${ASSUME_YES}" == "true" ]]; then
-      sudo apt-get install -y "${packages[@]}"
+      $maybe_sudo apt-get install -y "${packages[@]}"
     else
-      confirm "Install (or update) [${packages[*]}]?" && sudo apt-get install "${packages[@]}"
+      confirm "Install (or update) [${packages[*]}]?" && $maybe_sudo apt-get install "${packages[@]}"
     fi
   else
     echo "Unsupported OS: ${HOST_OS}"