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**hatzie** · 10-10-2021, 07:58 PM

I've matched mileage of repaired replacement digital clusters to the old otherwise damaged and not repairable old ones that still had readable chips. The intent was to make sure I was not changing the mileage. If I caught the wrong overzealous prosecutor they could probably still stitch me up for doing that.

If the odometer was stalled on the old speed head the mileage is already no longer accurate. If it's cleared 100,000 miles or you're not sure whether it's cleared that number you're obligated to check the exceeds mechanical limits or does not reflect actual mileage box on the odometer paperwork.
In that case I wouldn't bother with trying to match the new odometer to the old one. Something else to consider is the likelihood that the odometer gears are quite brittle with age. You run the very real risk of damaging your good replacement odometer.

I'd take the dead speed head apart and play with it to figure out how it works.

10-10-2021, 07:58 PM	#8
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,915	Re: rolling back or ahead the speedo mileage I've matched mileage of repaired replacement digital clusters to the old otherwise damaged and not repairable old ones that still had readable chips. The intent was to make sure I was not changing the mileage. If I caught the wrong overzealous prosecutor they could probably still stitch me up for doing that. If the odometer was stalled on the old speed head the mileage is already no longer accurate. If it's cleared 100,000 miles or you're not sure whether it's cleared that number you're obligated to check the exceeds mechanical limits or does not reflect actual mileage box on the odometer paperwork. In that case I wouldn't bother with trying to match the new odometer to the old one. Something else to consider is the likelihood that the odometer gears are quite brittle with age. You run the very real risk of damaging your good replacement odometer. I'd take the dead speed head apart and play with it to figure out how it works. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.