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Ferrari F40 Kit Car Speedometer won’t work, help?

We have an autometer, speedometer, and a 3800 V6 Engine, all the gauges work except for the speedometer and the tacometer. Suggestions?
We have an autometer, speedometer, and a 3800 V6 Engine, all the gauges work except for the speedometer and the tacometer. Suggestions?
Can someone elaborate on the first answer, not the, “Stop driving a fake” one? And, by the way, if you want me to stop driving a fake, buy me a real one. That’ll only put you in, you know, Six Hundred Thousand dollars…

I own a shop, and have extensive experience in building machines of all kinds. The first thing I would do is take a look at the wiring harness. I would assume it is one from a company such as painless. Many times this can be caused by a grounding problem, or should I say a lack of ground. Look for a ground strap that goes from the engine to the body/frame, and that you have a ground going from the battery to the frame. Since this is a fiberglass body, everything then must be grounded through the frame. A ground strap must go from the battery to the frame, and in order for your speedometer & tach to work, there must be a ground from these gauge assemblies to the frame, or there is no complete circuit. If you use a meter to ohm out the signal wire from the ignition to the tach, and the pick-up coil on the transmission to the speedometer gauge, then this only leaves a ground to complete the circuit. It is not likely both these gauges would be bad at the same time, so I would bet a lack of ground is the culprit. Many problems such as these is caused by a loose, corroded, or missing (earth) ground supply to the gauge in question. The signal sensors for both of these gauges is actually a generator, and is composed of a coil and a (magnetic pick-up) reluctor. Using a setting on the multimeter of the lowest setting (on the AC volts not DC), you should be able to probe the output of the speedometer sensor for a signal when the vehicle wheels are spining. There should be a signal that increases with speed of the output shaft of the transmission. If the signal is not there, then either the sensor (generator) is bad, or the wheel with teeth is not in relation to the pick-up coil. Since the voltage is so tiny that is generated from the transmission sensor, it is easy for this signal to not make it to the gauge, or in most cases no ground is present at the gauge to make it operate.
You might consider contacting Autometer for a diagram of how these gauges should be wired, and trace these wires with a meter for continuity (ohms) to the source as well as the (earth) ground (-) source. It could be the gauges are bad, but like I said, it is not likely for both to be bad at the same time.
Glad to help out, Good Luck!!!