Voltage Regulator- Who makes a good one post Covid?

Recently my ECU fried on my AC which was annoying. Replaced and it works (I hope it still does, I should say). Then the next time I drove the car (71 Demon) the new Classic Instruments Tachometer and Speedometer would intermittently quit working at roughly the same time. So today while taking the car out for a test drive after finding NOTHING wrong with the wiring on the instruments, I get a text and pull over. As I'm sitting there, the Spal cooling fan suddenly gets louder and faster (engine rpm not changing) and I notice the tachometer quit. I quickly realize there is probably an over-voltage issue and return home ASAP and sure enough it reads 17.1 V ! Oh, and I may have missed a connector on my new stereo when I replaced the AC ECU but now my stereo is dead too! I don't like knocking people or stores but I purchased the VR in question at a store that may wear green on St. Patricks day...just saying.

Question: Are there any sources for OEM or pre-pandemic quality voltage regulators?

Thanks, Jerry