Vic-on our 06 coach the buzzers signaled by the the annunciator that EMike is referring to are part of the speedometer. When all our buzzers went out we had to replace the speedometer. Actia returned a new speedometer and guages to us as part of the speedometer replacement.
I would recommend you call Patrick at Actia, phone 574-266-2649, and talk to him about the gauge if you are sure all the wires are connected. He is very helpful on gauge issues, and he turned around my speedometer within a week of shipping to them from Tacoma, WA. If you need to send the gauge, Actia will send you a form to send to them with the gauge.
2019 Winnebago 22M
2015 Jeep JK Rubicon
Former Owner, 2006 Alpine Coach 36MDDS
Former Owner, 2005 Tioga 31M and Arctic Fox 22GQ