No it will not blow your engine or tranny up it has nothing to do with either of them. The thing to look for is if a speed sensor is out.
it doesnt have one, it is an electronic speedometer
Speedometer either doesnt work, is erratic or works when it wants to. This may also cause erratic shifting in the transmission or transmission to stay in 2nd gear when in drive.
U need a new speedometer cable. It runs from the transmission to the speedometer. They tend to break in half or just seize up after they get so old. They are easy to replace, it takes to people to do it but it is really easy to do. I hope I helped you.
Toyota doesnt make a cavalier. The cavalier is made by chevrolet.
you need to change the speedometer cause if your odometer is counting then speedometer should be working too. make sure your speed gear its working its in the side of the transmission The odometer and speedometer read off of the same signal. If one works, the signal is ok and the other gauge is bad.
there are 2 ,the ones on the front brakes if you have ABS and the one inside the transmission that usually gives the speedometer the drive indication.
its broke
The VSS (Vehicle Speed Sensor) is probably bad. Also check the fuses.
Why doesnt your speedometer work on a 02 Mits Galant
This is for all cars and they take as much as possible as basically until its spilling out. Literaly you wont hurt it unless it doesnt have enough.
Your speedometer might not be connected if it does not work. It might also have blown a fuse if it is an electronic speedometer or it could have a wire that is loose.
if he doesnt know how then he must not be a very good mechanic, i have a 92 Spirit, same engine and trans as your caravan, that's if your packing the 2.5L engine... the speedsensor in the back should have the speedometer built