1970 Hot Wheels Tune-Up Tower: Dyno-Meter Head Unit

Now that we’ve got the main motor running, it’s time to start looking at the treadmill apparatus. First up is the Dyno-Meter head unit.


This unit contains the blue needles that mark out the Wheel Speed and Wheel Drift on the Dyno-Meter panel. It also consists of the orange arms that hold the car on the treadmill.

What’s the most common problem with these needles and arms? Some ham fisted kid back in the early 70’s decided to see how far he could bend them.


The Wheel Drift needle is bent forward.

The nearest arm is bent up and in.

The nearest orange arm is bent up and in.

Here’s my video on how to fix a wonky Dyno-Meter head unit.

So there you have it. The 1970 Hot Wheels Tune-Up Tower Dyno-Meter head unit fixed and ready to go.

Up next, how to get the treadmill running so we can keep Hot Wheels cars still fast. Still fun.

Tune-Up Tower box art - front. Close-up. Courtesy eBay.

Tune-Up Tower box art – front. Close-up. Courtesy eBay.

1970 Hot Wheels Tune-Up Tower: Motor

Usually, the first thing that doesn’t work right on an old Tune-Up Tower is the motor. The motor is housed on the top floor and lives right under the white toggle switches.




The electric motors that Mattel used in the early Hot Wheels line-up powered Super-Chargers and Tune-Up Towers. They were all made in Japan. In my experience, these motors are pretty much bullet proof.

2 way Super-Charger motor. Front view

2 way Super-Charger motor. Front view

2 Way Super-Charger motor.

2 way Super-Charger motor. Back view

When I get one that doesn’t run, more than 90% of the time it’s not the motor that’s at fault, it’s typically a bad electrical contact that’s the problem.

And the number one cause of bad electrical contacts in Super-Chargers and Tune-Up Towers? Corrosion on the battery terminal posts. Although a slow leak from alkaline batteries left in the battery compartment will produce a white calcium carbonate build up on the negative side of the battery, by far the biggest issue is copper tarnishing. Copper begins to oxidize when exposed to air. Basically, refined copper metal will automatically return to it’s more natural state which is an “ore”.

Here are 3 questions:

  1. How do you access the metal contacts on a Tune-Up Tower?
  2. How do you go from tarnished
    Tarnished copper.

    Tarnished copper.

    to golden?

    Cleaned and ready to conduct electricity again.

    Cleaned and ready to conduct electricity again.

    3. Will the toggle switches and motor work again?

Find out what happened on my YouTube video.

Next up: I begin work on the treadmill apparatus.

The 1970 Hot Wheels Tune-Up Tower. It makes Hot Wheels still fast. Still fun.

1970 Collectors' Catalogue.

1970 Collectors’ Catalogue.