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I had to adjust mine. Used th little hole in the back & a screwdriver.
I hooked up a sun tach in parallel with the factory tach, and adjusted and adjusted and adjusted. Make sure when you're done adjusting that they match throughout the RPM range. If it doesn't, adjust at a different RPM. Took me probably 5-10 minutes of adjusting before they would match throughout the rpm range.
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my 2ยข - t.i.o.l.i.
Bowen
1968 K20 fleet
1969 K10 swb fleet
1972 K10 Suburban
1972 C10 lwb step
1992 K1500 'burb
1995 K2500 'burb
1997 C1500 'burb
1999 K1500
2000 K1500 'burb
Why do I own so many Suburbans?
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