I struggled with the same set of problems for years. I had the tach shown mounted on the left side of the instrument cluster hanging under the dash pad for a while.
When I purchased the car it had a set of three gauges where the two are now. I took them out and lived with idiot light for quite a while then broke down and added the two you see, oil pressure and engine temperature. Why didn't Buick offer a gauge package!!!
I had an aftermarket Custom Autosound with a booster and speakers which I didn't listen to that much and looked like.... So I watched for an am/fm and paid big bucks for one out of a '66. That works perfect with a Belkin fm transmitter which is stored under the seat. I then just plug in my Iphone when needed. There are outfits which will do a pretty nice job of adding fm to the stock radio, and they will also add usb ports and boost output.
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