AE82 rpm tacho signal

[Cuzzo]

Where does the stock AE82 rpm tacho get its signal from?

Can i connect the rpm tacho to the -ve of the coil.
Reason being im still trying to install my shiftlight(as people might have read)
and its not responding properly.

[myne]

Passenger side kick panel should have a detatchable plug containing lots of blue wires.
The blue wires are for the windscreen wipers, however within that plug should be the tacho wire. The yellow wire is for the charge light.

From memory the tacho wire is black.

[Cuzzo]

ok and where would that go into the engine bay? would that go to the ignitor or the coil?

[myne]

Should be from the negative of the coil.

I cant verify because I have a gze.

[Cuzzo]

anyone want to verify?

[sideshow]

most tacho wires in toyotas come from the ignitor
just conenct it to neg side of coil

but u said the shift light has an in and an out

thats very strange and i would not do it incase something fuks up and then yr car wont run

i bet its one of those wanky things of ebay

so many people buy shit lioke htis of ebay and alot of time these no bloody proper instructions

anyway do u have instructions for it

[Cuzzo]

yeah i have instructions for it you can find them

here http://www.gizzmoelectronics.com/pdf/TECHRECALL.pdf

im using the thick black wire on the back of the tacho. i have traced that wire using a continutity test and it goes to the ignitor.

The only problem im having with this shift light is that when i connect the shift light "in series" and try to set the shift point using the two buttons the needle doesnt move.

By the diagram that i got in the instructions it tells me to join the rpm signal wires in series through PIN 3 on the ecu (IGF - Ignitor wire)
What does this IGF Wire do?
I would really like to do this myself but if all else fails, i think jim will be paying me a visit.
PS . i got it from autobarn blacktown.

[WiLo]

if you have an ae82 (as the title suggests) take the instrument cluster out and at the rear you will find there is a little terminal for +and- ign, might be able to find a way of getting a connection off there, im dodgy and could find a way but others might not

[thechuckster]

all the gizmo thing needs to do is cut into the wire that signals the tacho.

It doesn't matter whether it comes from the coil or the ignitor or the ECU, as all the device is doing is driving your tacho to show the peak revs or shift rev points.

So the close to the tacho, the safer you're going to be. The end result is something like:
ECU-or-Coil-or-Ignitor --> GIZMO --> Dash-or-Tacho

The gizmo device has to sit between the tacho signal source and the tacho otherwise you wont know what settings you're applying to the device.

The gizmo box is not driving your coil or ignitor or anything clever. The only thing it drives is the tacho when you want to set shift points or display recent/saved peak rpm values.

[Cuzzo]

thats the exact info i was after however i had done this and i cant set the shift point. the rpm needle does not move at all.
WTF

[thechuckster]

engine running at the time? power supplied to gizmo?

[Cuzzo]

just there is power at the gizmo at the time of the engine running. i have wired a constant power atm(no indication on the instructions to run constant or not.- i thought it needed constant because it memorises the highest rpm at each gear change)