2000 Mazda mpv could start without the dash assembly and speedometer

And you checked for a failed or dead battery?

I think your saying the speedometer is working then not working as that could be the speedometer cable is broke/damaged and just buy on and install.

I think it may be an electrical issue but I think it's just a fuse. There are 2 fuses I would check. One of them is a 15 amp fuse inside the fuse panel inside the vehicle (see fuse layout below) and the other is a 40 amp fuse in the fuse panel under the hood of the vehicle in the engine compartment (see other picture below). I marked the fuses to check and hope this is the problem.

There is a speed sensor for the transmission inside the speedometer gauge.
if the speedometer cable is broken the hold light will blink. indicating a trans
malfunction code and the transmission will not work properly.
do not drive too long without a speedometer cable.

I'Ve change Tie rode end front 2 sides, I'Ve change Link kit
Still ear some rattle ?

Hello your speed sensor is malfunctioning this is connected to your speedometer.this is usually located on the top of your transmission 10mm 0r 3/8 bolt single plug this will restore your vehicle speedometer.

Your latch assembly may be frozen, or the door actuator faulty (a common problem on this vehicle).

Check out the following forum posts:

The basic problem:

http://forum.mpvclub.com/viewtopic.php?t=24351&highlight=door+actuator

Photos of the latch assembly:

http://forum.mpvclub.com/viewtopic.php?t=16431&highlight=panel+door+locked

How to disassemble the door panel (if you can open the door!):

http://www.mpvclub.com/diy.php?id=8

Check the battery and try to jumpstart your car. Or borrow an OBD II scanner and plug it in to the connection under the dash/steering wheel area and see what the error code, problem is.

Couple of things it could be.

Try turning it over without touching the gas pedal. Sounds like you flooded it.

Check the coil and engine management sytem. Its probably that.

look here: http://www.bongoforum.co.uk/forum/Blah.pl?