If your 1988 Mark VII shows a speed of 85 mph and the odometer is still adding miles while in park, it suggests a malfunctioning speedometer or odometer. Typically, the speedometer should not register speed or add mileage when the vehicle is stationary. This could be due to a faulty speed sensor, a wiring issue, or a problem with the instrument cluster. It's advisable to have the vehicle inspected by a qualified mechanic to diagnose and fix the issue.
To cause a speedo to jump around, you might use a combination of mechanical movement and external forces. For example, placing the speedo on a vibrating surface or using a small motor to create rapid oscillations could make it bounce. Additionally, if the speedo is filled with air or liquid, fluctuations in pressure could cause it to move erratically. Overall, adding an element of motion or vibration is key to achieving this effect.
There is a separate motor that runs the odometer. It is not running for some reasson. TAke it to a speedo shop.
The easiest way to ruin it is by running it without oil. Adding water to the oil or air intake would also do the trick.
HI Renew the speedo cable
Miles - How far the vehicle traveled. Hours - How long the engine was running. Every sit at a traffic light with the motor running and the car not moving? The hour meter keeps ticking but you're ading no miles. Why would you think the two meters should match? Think...
Tach is driven by a motor signal, speedo is from the trans the sensor is bad on the transmission
The running refrigerator motor is using electrical energy to power the motor, which in turn drives the compressor to cool the refrigerator.
380v 60 hz is suitable for running 180kw induction motor
Gear oil should be changed every 4,000 to 5,000 miles. Motor oil should be changed every 3,000 miles to keep the engine running clean.
motor stops
It is the twisting force that a motor can produce when it is running.
There should be a cable that screws in the back of the speedo and into the transmission, the motor size has nothing to do with it.