Needs helps. - 1993 Mazda 626 V6 2.5L

Hi,

I need help with my car. I have a 1993 Mazda 626 cronos, V6 engine. I always maintain my vehicle well, but lately it acting little weird. The problem is that, when I accelerate or driving for that matter, the odometer hand on the dusk-board seems not to function properly. The engine is function as normal, the car is moving forward as I driving/accelerate, but the odometer hand doesn’t seem to work (doesn’t show how fast/slow I’m driving). If it’s working, when I removed from the gas pedal, the odometer hand drops dramatically. Is this electrical/wiring problem or engine problem?

There is another problem that I can’t seem or any technician to figure-out. Every time I drive for 30 minutes, a group of 5 beeps, beeps 5 times, total of 25 beeps go off without showing any problems. It kept repeating every 30 minutes.

Thank you in advance
C.K