The tach pulls info form the coils via the CDI. Makes sense the tach would go nuts if the coils started crapping out. Coils can still take time to reach a certain operating temp.
Wish I had time or lived closer. Id love to help you with this so it cost you as little as possible.
Think Cascade would let you borrow a set of coils for a few days to test with?
SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
NEW: 19 Goldwing Tour DCT
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