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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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Each tachometer is not reading 12v but rather dwell / on time from the Neg or trigger side of the coil(s) . They do share running ( positive) voltage and ground to operate. There may simply be resistance on one of those circuits.
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss
'07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold
'85 Guards Red Targa - Almost finished after 17 years
'95 Road King w/117ci - No time to ride, see above
'77 Sportster Pro-Street Drag Bike w/93ci - Sold
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