msd box and tac
09-07-2005, 07:53 PM
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msd box and tac anyone have any problems hooking up a tac and a msd rpm box...just did one and the rpms on the tac (autometer) and the rpm box dont match the stock one. Not even near eachother. Stock one reads 800-900 autometer and msd box read 300-400
09-07-2005, 08:07 PM
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My experience It seems our LS1's put out a 4 cylinder tach signal. set the MSD box to the 4cyl setting and like on my autometer tach, you have to snip the 2 small looped wires in half to get the tach to read as a 4 cylinder vehicle. Your RPM's should match then
