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87 el camino, 305h motor, est dist with external coil, originaly with idiot lights. i have installed tach in dash and have tach filter in line. where do i pick up the tach sig with this type dist? there is a pin off the 7 pin module thats called reference signal goes to pin 10 on ecm. is there a pigtail or place on the coil to tie the filter to? dont want to fry ecm or module.
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