Odometer doesn't move and RPM is showing while engine is on.

Sounds like you rev gauge wasn't working and now it is . If you are sitting in the car , have it in neutral and depress the gas pedal your rev gauge should increase , if it never moved there's a problem , the wires at the back of the odometer were probably loose

check fuse first. (as always)
what is the odometer doing.
caldina?
non here.
my wild guess, no FSM on that.
is:
1: the VSS is dead.
the questions is where is the VSS , vehical speed sensor.
on most cars that depends on engine options and transmission options.

i think? the VSS tells the PCM speed, and the PC drives
KM meter and odometer.
and RPM is PCM input of Crank sensors
so id say fuse, but the odometer questions is more revealing

define haywire.?

dead, off, and is odometer off too?
stopped, you mean the car stalled?

when the engine stalls you see the following (driving school 101)
1: quiet , now. from engine.
2: steering and braking get harder. up to 6 times harder.
3: RPM tachometer shows 0 RPM.
4: Speed drops and lands on zero as car stops or you run out of down hill free right.

so did engine stall? does it restart,?

yes. The speedo works of the tail shaft revolutions regardless if the engine is running or the vehicle is being towed. It may not if the speedo is through the cpu unit and transmission module with the power off.

You may have this posted in the wrong product category. Please select another category appropriate to the problem and re-post the problem so the correct expert will see and respond to the question..
This is for car and truck problems related to factory installed systems not add on aftermarket systems.
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i would start by looking for a bad connection at the battery and fuse boxes

How many miles is on the odometer?

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Does this happen when the engine is cold (during start up)?

A intake manifold leak will progressively get worst when the engine get to operating temperature (195-210F).

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Carbon built up (on the underside) and inside the EGR passage tube can reduce performance at low rpm (1200 to 1800 rpm).

Cleaning up EGR + passage tube carbon built up is a dirty and time consuming task.

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Please post the odometer reading on reply.

sounds like a computer reset problem

my speed odometer dont work

check the fuses?