[Vwdiesel] Tacho Find

[Mark Shepherd]

A few days ago I was down my local Car breakers and I
spotted a diesel tacho in a lorry. Couldn't leave it so I
had it :o)
It looks like a motor cycle rev counter in size about 3"
across.  The scale 'max's out at 3500 rpm. It must have been
attached to the alternator 'W' connector but as the alt. was
gone I couldn't see the pulley ratio ( although this
wouldn't tell me the No. of poles...) The three wires
(excluding the light) were black/yellow streak, red /orange
streak and brown. Definitely not British Standard colours!
It turns out it works on my alt with the black one being
batt+ red being signal and brown earth(-ve)
I thought to myself how can I check the calibration without
another  diesel tacho?
Well I reckon that if I was to use a gas strobe on a gas car
parked alongside my 'Q' and used it to strobe the diesel fly
wheel at different speeds of the gasser (noted with its
gasser tacho) and then adjust the speed of the diesel to
match that'll do it (clever eh :o)

Alternatively I'll just throw this back into the sea and
convert one of my oem gasser tachos...
_________________
Mark-The-Miser-UK

"There's nothing like driving past a bonfire and then
realising; its your car on fire"

Be like me: drive a Quantum TD