Did you ever try to repair the big clock in the dash? I have a 67 Impala and started this process. Learned several things I thought I'd share.
My clock was mostly good, just got dirty and stuck. So a cleaning with alcohol and a toothbrush did some good, then I made a mistake and over lubricated it with a silicon spray. That made the spring on the escape wheel fall off but I didn't catch the mistake until much later and lots of research. Here's what it looks like:
See how the gear in the middle is resting on the brass shelf and there is a small gap between it and the axle spring? that's not good. basically the escape gear just spins as quick as the arms can fly around the face of the clock very fast. It's funny to watch, but it can't be good for the electronics, ha. OH, and see that red wire in the bottom right? Apparently that burns out quite often in these clocks when the battery runs low. Check there and solder in a jump wire if yours is broken.
I cleaned the excess lube off. Learned there are only 3 spots to lube, now I know why. A drop of superglue will hold that spring onto the escape gear.
Then setting the clock with a timer while it's on the bench is a very good idea. Set it at noon and start your cellphone timer. There is a lever you can adjust manually while disassembled that you can't get when in the dash. Once in the dash, you can get it accurate within minutes or seconds with patience by going forward 12 hours or back 12 hours as this is a self-adjusting feature that makes the clock run a little faster or little slower. i.e. if your clock is going too fast, then adjust it backwards by 12 hours. If too slow, adjust it forward by 12 hours.
GOT A REPAIR TO MAKE AND NEED HELP?
Here's my experience with the Repair shops. I looked them all up emailed them each. Only some took time to reply to me with any detail at all for advice and quotes. Some offered a DIY kit to go to Quartz... a very reasonable worry-free choice.
if you have a Borg clock like mine, the DIY quartz kit from Instrument Services aka http://clocksandgauges.com/
800-558-2674 was the best price and the best customer service I got over email. The quartz conversion kit is #S-3015 for $65.00 + $14.00 shipping and handling(within the US). Or a full service $110 installation.
A lot of folks recommend http://www.clockwks.com/The_Clock_Worx.html
but their kit was 95 and 150 for full service by comparison plus shipping. They offered no tech advice for my symptoms.
The only place that actually diagnosed my broken clock correctly was Omicronclock. They were friendly and helpful and list the DIY kit here http://www.omicronclock.auctivacomme...-P2396866.aspx
for the kit $82. He offered full service repairs too.
D&M Restoration was the least helpful reply and highest price for a full-service restoration only and it was 185-225.
I hope this helps everyone dealing with a ~60's Chevy original dash clock. I like the original clock for as long as it will work, but if it breaks again, the Quartz kit looks like a low-hassle swap.