Voltage Gauge flatlined

[Durio]

Took my 89 5.7 OBS Silverado out for a cruise yesterday and noticed the voltage gauge wasn’t working.. Battery tested at 12.46 and with engine running 14.47, That tells me Alternator is good. Was working last time driven. Battery is on trickle charger when sitting in garage so charge is good. Is there a fuse or fusible link for just the voltage gauge. Looking for answers before I go in and replace. Thanks

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[Schurkey]

Download the service manual set for your vehicle. The schematic will be included.