Bench testing rally gauges

Mattax said
The IVR powers the Fuel, Oil Pressure and Coolant Temperature gages.
It's not a true regulator. It rapidly switches on/off creating the equivalent of 5 Volts as far the instruments are concerned but there are some sublte differences compared with a constant on 5 Volts.
Anyway its an electrically noisy process. The capacitor makes it less so. We could see what Chrysler says if it also helps steady the power supply out. Redfish probably knows.
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One of the other posts referred to a YouTube video for 69 Valiant instrument troubleshooting. Watched the video and it definitely seems like a power issue due to all the gauges looking like the power is removed and the gauges Slowly going dead and then recovering to there original positions or like they were powered back up. That is why I think the IVR is what I have an issue with.