Petrol clocks to diesel? Tacho Q?

[stonyray]

OK, if I put some clocks out of a 205 GTi into my D Turbo can I just wire the tacho signal wire to the Alternator signal tag (W)? Or will that not work or read wrong?

[sparkyt]

On my derv golf mk3 that is exactly how it was done . .

My problem is I'm running the petrol alternator which doesn't have the terminal .

I will be replacing the Ault when it dies and just live without for now

[stonyray]

That is pretty derp. GTI clocks purchased!

[MrSpeedy]

It depends on what your tacho reads. On petrol engines, older ones anyway, they count the pulses from the ht coil.

Alternator driven ones count the phase changes in the alternator. Completely different frequencies.

[welshpug]

pugs used a crank sensor on the diesels, probably there but no wiring in the dash, the diesel tacho is different

[stonyray]

A crank sensor even on the XUD7T? Any way of modifying the signal to read correctly? I don't fancy finding an after market diesel Tacho as they're about 50 quid and the GTI clocks were only 25! Plus I get oil pressure and temp (when I get the sensors).

[lordyoung1980]

Not sure on the xud7 but my 306s all had a sensor on top of the bell housing. Worth a look. Also your redline will be in the wrong place for a Derv.

[stonyray]

I know my redline is 5K and will be raised to 5500 along with some other watery, methanoly mods. I shall double check and see what the craic is,