TVR Speedometer Correction ?

[electron]

So I've decided to put the TVR on the road to try to iron out a few minor bugs ...

It has an XJS 3.6 Manual Salisbury diff which from the tag on it I make a 3.54.

I'm running 15" Supalites with Yokohama 195/55/15's

So the questions are ...

1) What is the standard diff in a TVR 3000M 1974 ?

2) Any pointers to a wheel rolling radius calculator on the web ?

3) Does the panel think I need to get the speedo recalibrated ?

If yes any clues where ? :-)

Thanks

Chris

[electron]

Thanks for the replies.

One other suggestion was to pop down to Halfords and splash out on a cycle speedometer. My classic motorcycle friends have done this to save weight/complexity.

I came across www.speedograph-richfield.com/ which has the manual calibration form and this is the route I'll go down as it looks like I'll get my original speedo recalibrated correctly

I'll post the results.

Thanks Again

Chris