Does anyone know how?

I haven't got my engine running yet and would like to test a Smiths electronic tacho that I have bought.

TIA.

Do you know someone with an old-technology petrol-engined car? Not stuffed full of electronics, I mean!

If so, you can lash up one lead to +12v, one to chassis, and one to the points side of the coil.

If it's a recent model, and you haven't got a wiring diagram, look at

http://www.caigauge.com/

(This is Smiths under a different label)

And there you go - Roberts' your mother's brother!

cheers,

David

The tacho will be calibrated for a 4 6 or 8 cylinder engine - doe s the handle "JAG" hint at a 6 cylinder possiblility. So watch out! Theres generally a pot (like a volume control) on the instrument's PCB somewhere which you can tweak to get it spot on. There's usually only one so it's hard to screw up. To adjust properly youi'll need a calibrated signal generator with a 12V output or (better) a calibrated frequency meter & a variable frequency source. When I put a V8 in a mazda mx5 I was able to make the tacho right just by tweaking the pot on the original mazda instrument.
cheers
Bob C

Thanks for all the info guys.

'JAG' is just my initials - no loyalty to any Browns Lane/Coventry based Vehicle Manufacturer is intended

I'll see if I can attach it to a friends Pinto engined MK. Thanks again.