SD Tacho -- clockwise or anticlockwise?

[chrism0dwk]

Hello all,

I have a question about a 1963 Super Dexta tachometer: currently mine appears to be the clockwise type, but has stopped working. It seems you can get new tachos easily enough (even in NZ!), but all the catalogues are telling me that SD's use the anticlockwise type. I'm hesitant to buy an anticlockwise tacho in case it ends up being driven the wrong way, and wondered if anyone might know what is going on? Does the drive direction matter?

Cheers,

Chris

[Bensdexta]

I have a question about a 1963 Super Dexta tachometer: currently mine appears to be the clockwise type, but has stopped working. It seems you can get new tachos easily enough (even in NZ!), but all the catalogues are telling me that SD's use the anticlockwise type. I'm hesitant to buy an anticlockwise tacho in case it ends up being driven the wrong way, and wondered if anyone might know what is going on? Does the drive direction matter?

I got mine repaired and recalibrated by these folks, cost ~£100:
http://www.speedograph-richfield.com/

Perhaps a bit more expensive than a repro, but should be good for another 50yrs.

[pjjms]

There's a seller on trademe who sells them in both rotations. Check out this listing number


Fordson Tachometer
Start price: $85.00 No reserve Closes: Thu 21 Nov, 10:08 am Listing #: 662423206

[chrism0dwk]

Thanks folks!

Chris

[Lesfen]

Hi Chris,
Dexta and Super Dextas rotate counterclockwise unless the block/engine had been replaced by one from those other guys which are driven from the end of the camshaft as opposed to the end of the Simms injecton pump.
Petrol Dexta tachs rotate clockwise so hang on to it if it is an original!
(Photo would be great!)

Les

[chrism0dwk]

Hi,

Well, that's strange then. Someone must've put a clockwise tacho in at some point. No wonder it doesn't work! Minor issue currently though, as the engine's playing up big time.

Chris

[Les bryant]

Chris,Just checked mine anticlock wise.Cheers Les.

[pjjms]

Sounds like you have a petrol dexta tachometer fitted