My volt gauge has never worked right. I wouldn't worry about it unless it's accurate and your power is cutting out. 
The tach is run off the trailing coils. If the tach isn't moving, then the trailing coils aren't firing.
As for the dying when shifting, it probably has some vacuum leaks or other idle issues that are being masked by the BAC. Unplug the BAC and see what happens at idle.
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1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles
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