TR250 Tachometer

[tom hall]

After many years of the tachometer over-reading I think a job for this winter will be a re-calibration or replacement. I am assuming that the head/ratio is incorrect, could any  one be able to give me the correct head ratio number in order to facilitate this. The current head is 3.55:1

Photo of existing head enclosed.

Thanks

Tom.

Edited September 20, 2021 by tom hall

[BlueTR3A-5EKT]

My book says RN2413/00A is the spec number from Smiths.  Should be on the dial face.

[tom hall]

Thanks Peter, just had another look on the dial - I hadn’t spotted the numbers partially hidden at the top. They read 2413/00A! 

The rev counter is definitely out - the car ticks over lumpily at 1400rpm…

I’ve had previous machine readings of a true 1000rpm with the rev counter showing 1500rpm, up to 4000rpm showing as 5500 rpm

I’ll have a look on line at the usual suppliers.

Edited September 20, 2021 by tom hall

[stuart]

Have it converted to electronic would be better.

Stuart.

[tom hall]

44 minutes ago, stuart said:

Have it converted to electronic would be better.

Stuart.

Thanks Stuart, food for thought….

[Dave McDonald]

I've recently had mine refurbished and converted to electronic by Classic Spares and Engineering in Scotland. 

The car restoration isn't complete yet, so I can't report on its' accuracy in use, but I'm very pleased with the external finish and they were easy to deal with and didn't take forever and a day.

No connection, just a satisfied customer.

Dave McD 

[stuart]

Direct link https://www.classicsparesengineering.co.uk/index.php

Stuart.

[tom hall]

2 hours ago, stuart said:

Direct link https://www.classicsparesengineering.co.uk/index.php

Stuart.

Appreciated thanks to both.

Edited September 22, 2021 by tom hall