Proton satria 2003 tacho wire

Hi. Thanks for your question. For location of interior fuse box location you can visit https://www.reliable-store.com and download the entire workshop manual which includes all the information along with the diagrams for better understanding. Good day!

You need to determine if the sender is bad or the gauge is. If you can get to the signal wire at the fuel tank for the gauge (this goes inside tank to sender that provides a variable ground circuit) ground that wire briefly to see if dash gauge rises. If so, part inside tank is bad. If not, gauge or some part of its wiring circuit is bad.

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you have an in cluster factory engine tachometer (RPM)?
the tacho is meter in the cluster and does not use speedo parts or its cable.
its just a meter that needs power, ground and spark tacho signals
if all 3 are good, the meter is bad. period.
the tacho signal goes to the ignition coil minus lug, and will good, as engine runs. so... wires bad, to tacho or tacho bad.
ever price a new one? or even used? $100 used?
you willing to pay that much for just a factory tacho?

there is NO speedo cable. this old 93 is electronic, (rare on most 93 cars made, toy is advanced)
here is the proof, amazing how books dont lie....
there is a speed sensor.
the tacho and speedo use the same power and ground
leaving just one wire,r-g red-green RPM sig. pin 5 of cluster
an is SPARK primary sig. so if only tacho is dead.
then the tacho is bad, or that pin 5 wire is dead.
got you to just 2 possibles.

It may be that the speedo and temp are mechanical, whereas the tach and fuel are electrical. Check fuse for inst. cluster for clean and tight fitment. Check electrical connection at back of inst. cluster.

You will need the original master key to do it yourself. Best to get it done by experts with the proper equipment like a scanner. Some scanners can do it if you have the original master key.