All Ol' Tessie Upgrades in Call of Duty: Black Ops 7 Zombies
Ol' Tessie may look like an old, rust-covered transport vehicle, but in Call of Duty: Black Ops 7 Zombies, she's one of the most important tools you'll ever unlock. Acting as a pseudo-Wonder Vehicle, Ol' Tessie lets players move safely across the sprawling Ashes of the Damned map without being overwhelmed by the Dark Aether's hazards.
If you're searching for all Ol' Tessie upgrades in Black Ops 7 Zombies, this article breaks down how to unlock each one, what they do, and how they help you survive the map's deadliest routes.
How to Get Ol' Tessie in BO7 Zombies
Before upgrades become available, you'll need to assemble Ol' Tessie. Start at Janus Towers Plaza, the Ashes of the Damned spawn area.
1. Enter the Server Room on the south side of the plaza.
2. Strike the grate on the floor with a melee attack.
3. This reveals T.E.D.D.'s Head, which you can pick up.
4. Exit the Server Room to find a disabled truck nearby.
5. Interact with the truck to place T.E.D.D.'s Head inside.
Congratulations, you can now drive Ol' Tessie and begin upgrading her.
Pack-a-Punch & Rocket Boost Upgrade
This is the first big upgrade most players aim for, and it's essential for long-term survival.
Step 1: Power the First Two Pumps
Complete a Power Pump event at Vandorn Farm or Blackwater Lake. Doing so unlocks the gate leading into Ashwood.
Step 2: Power Ashwood
Inside Ashwood, complete the Ashwood Bridge Power Pump.
Step 3: Upgrade Ol' Tessie
At the bottom of Ashwood, drive Ol' Tessie into the garage.
In the west corner, interact with the Pack-a-Punch machine.
What This Upgrade Does
·Adds Pack-a-Punch access to Ol' Tessie (use the rear panel).
·Grants the Rocket Boost: press L3 to blast forward, instantly clearing zombies from the vehicle and granting high-speed travel.
·The boost has a moderate recharge, so use it to escape or navigate choke points.
Abomination Heads Upgrade (Beam Attack)
The Abomination Heads give Ol' Tessie an offensive weapon capable of vaporizing anything blocking your path.
How to Unlock It
1. Drive Ol' Tessie through the southwest Ashwood gate to reach Exit 115.
2. Enter Reba's Diner and wait for a special zombie named Chef.
3. Defeat the Chef to receive the Freezer Key.
4. Use the key on the freezer door on the diner's southwest wall.
5. Inside the freezer, pick up the Abomination Heads.
6. Return to the Ashwood garage and interact with the mounted heads on the wall to install the upgrade.
What the Upgrade Does
·Grants R1 Abomination Beam Attack.
·Fires a continuous energy beam that disintegrates enemies and blockades in your path.
·Especially useful for safe travel between the map's most dangerous zones.
Wunderwaffe DG-2 Turret Upgrade (Mounted Turret)
This is the hardest Ol' Tessie upgrade to get and requires multiple quest steps, key items, and the Necrofluid Gauntlet.
Step A: Get the Necrofluid Gauntlet
This long questline is required since the Gauntlet's powers-especially shooting and reloading to pull items-are essential during the upgrade steps.
Step B: Collect Serum Ingredients
You'll need the following:
·Ravager Eyes - Kill a Ravager using the Saw Blade Trap at Vandorn Farm.
·Human Bones - Throw a Combat Axe at the hanging corpse's right foot in the Farm Barn, then throw a Molotov on the fallen foot.
·Mysterious Limb - Kill a Zursa bear using the Abomination Beam.
·Hoard Husk Chunks - Use the beam attack on purple plants found along connecting roads.
·Widow's Lantern - Pick up the Jar of Spores in Blackwater Lake's cabin, interact with the dead horse by Vandorn Farm, then collect the Lantern three rounds later.
·Powder of the Forgotten - Buy Wisp Tea in Zarya Cosmodrome, bring it to the Ashwood Tailor mirror, and shoot it with the Necrofluid Gauntlet.
Step C: Brew the Serum in Yuri's Lab
Go to Zarya Cosmodrome, enter Yuri's Lab, and interact with the powder on the table.
Three symbols appear on the chalkboard. Interact with the corresponding ingredients in the correct order:
·> - Human Bones
·L - Hoard Husk Chunks
·C - Widow's Lantern
·C. - Ravager Eyes
·L. - Mysterious Limb
Add three ingredients in the order shown, then interact to add blood, starting a lockdown. Survive the fight using the Necrofluid Gauntlet.
Step D: Collect the Three Keys
After the lockdown, a floating clock tower appears, and a locked box spawns at Rabbit Alley.
You must now locate three hidden keys on the connecting roads:
1. Bruin Key (Yellow) - Road to Zarya Cosmodrome
·Picking it up forces you to equip your knife.
2. Nightbird Key (Red) - Orda Graveyard to Exit 115
·Picking it up disables health regeneration.
3. Terrapin Key (Green) - Grounded Ship road
·Picking it up disables sprinting.
Shoot each key with the Necrofluid Gauntlet and reload to retrieve it.
Return each key individually to the Rabbit Alley lockbox to loosen the chains.
Step E: Claim the Wunderwaffe Turret
After delivering all keys, a cutscene plays.
You can now pick up the DG-2 Turret Barrel and install it onto Ol' Tessie inside the Ashwood garage.
What the Upgrade Does
·Grants Ol' Tessie an automatic Wunderwaffe DG-2 turret.
·Fires at zombies without requiring a second player.
·Importantly, the turret won't kill the last zombie, allowing you to keep a round alive for quests.
How to Repair Ol' Tessie
Throughout your matches, Ol' Tessie can take damage from zombies and environmental hazards. Repairs can be performed at vehicle stations located around the map (especially in Ashwood's workshop).
Final Thoughts
Whether you're progressing easter eggs, pushing unlocks, or practicing routes inside Call of Duty Black Ops 7 Bot Lobbies, a fully upgraded Ol' Tessie is one of the smartest investments you can make in Zombies.
If you want an easier time mastering these upgrade routes, you can also buy CoD Black Ops 7 Bot Lobbies to practice without pressure before diving into full public or co-op matches.