AUTOMETER TACH WIRING LS1
GM LS Engine Gauges Installation Guide - autometer
GM LS Engine Gauges Installation Guide 2650-1563-00 Rev. A This Guide will cover all of the current GM LSc family of engines, including but not limited to: 4, 5, 5 (LS-1 Version only), 6, LS1, LS2, LS3, LS4, LS7, & LS9 engines. LS history: The LS engines were introduced in the ’97 Corvette, and followed in the ’98
RPM SIGNAL ADAPTER FOR DISTRIBUTORLESS IGNITIONS
Thank you for your question. This is a popular product and we have not heard this issue before so I would reroute your wiring. Move your grounds to an engine ground and move the tach adapter wiring away from the radio wiring. That should eliminate the interference.