A cars tach jumps and runs with engine rpm.Sometimes if it jumps and changes engine sound,the throttle position sensor needs changing.If it jumps with no engine speed or sound change it means your alternator is going bad.
To fix a tachometer needle that is stuck on the wrong side of the resting pin, first, carefully remove the tachometer from the dashboard. Gently pry off the glass cover to access the needle mechanism. Use a small tool to nudge the needle back to its resting position, ensuring it sits correctly on the pin. Reassemble the tachometer and reinstall it, checking that the needle functions properly before closing everything up.
Check the speed sensor
run a new line to the distributor.
kangaroos
my friend jumps up and down.
The motion of the needle in a sewing machine is vertically, rapidly up and down.
it jumps up an down
how high you can jump straight up and down.
it jumps up and down
Your head jumps up and down.
anything that can jump but ON A PLANET WITHOUT GRAVITY!!!!!! Also in space where up could be down and down could be up. If a person jumps into a volcano the person will vaporize and the air particles will float upwards and possibly float into outer space where there is no up and there is no down.
Automatic declutch bobbin winder – which means the machine automatically stops the needle from going up and down when you are winding thread onto the bobbin. ... Needle up/down button – this button allows you to start and stop with the needle in the down position if it is highlighted.