1997 Tahoe 5.7 Vortec
2 Answers
Set TDC the old fashioned way. Remove the spark plugs and turn the engine until it is TDC #1 by feeling the compression at the spark plug hole. This will get you close enough to know which mark is correct. Paint the correct mark.
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I had the same problem and had to remove the #1 plug and feel or guage compresson and u can get the correct one . PS I marked mine with a paint marker In case I ever needed it again.