fbekholden.com

Thanks Harv, might be the go!
S

Took Harv’s suggestion and fired off an enquiry (no ability to send pictures) to Stewart Warner the other Sat evening, thinking I’ll probably not hear back. Bugger me got a response about an hour or so later saying there might be a wire missing but send the SW engineer some pictures.

Sent the pictures only to be told they don’t recognise the tacho. It must be an old one!! I may need a SW sender unit which is not made anymore so SW engineer suggested eBay!!

Back to square one with more head scratching

Pulled the unit apart again and came to the conclusion the blue and green power the back light whilst the red and black go to a coil (via selector switch and various resistors.

In essence a moving coil meter where there is a pulse received from the dizzy side of the coil. So hooked it up and whacko it worked. Happy days.

Good outcome

Cheers,
Harv