1981 speedometer new face calibration change
Thread Starter
Racer
Joined: Nov 2011
Posts: 319
Likes: 12
From: South Chase WI
1981 speedometer new face calibration change
So if one buys the new 140 mph face from Corvette Central, what else must change to make it work correctly at all speeds? New gear in the trans? I searched and found a service that does it, but what is it they do?
Thanks
Thanks
Melting Slicks
Joined: Jul 2010
Posts: 2,503
Likes: 33
From: McGrady NC
St. Jude Donor '15-'16
I bought an early '79 speedo and tach from a forum member. Now I have a 140 mph speedo and the L-82 tach in my (originally L-48) '80. Seems to be accurate compared to road traffic after driving for several miles so I'm happy. It's a bunch cheaper than the conversion services from my experience. Just saying'...
Le Mans Master
Joined: Sep 2004
Posts: 5,116
Likes: 5
From: Livonia MI
I've redone speedo faces on 85 mph jobs, when there were more calibration places around. If you look at the inner workings of a speedometer, there's a round magnet spinning inside a metal cup, held back with a clock spring. Speedo shops, change magnet and clock spring strength. You're not wanting to change drive gearing, or the odometer will be way off. Haven't done this in a awhile, but "speedometerrepairguy.com", could surely help out.
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