GTV6 Speedo reading adjustment
Posted: Wed Nov 09, 2005 2:22 am
Here's two alternatives to get a GTV6 speedo working and reading correctly.
First option works for a transplanted 75 transaxle and sensor, I used the Dakota SGI-5 unit, which has a variety of settings to run pretty much any type of speedo on the market. If you use one set it up like this:
Only 4 wires are attached to the SGI-5: 12v Power, ground, signal in and signal out.
On my GTV6 the loom from the speedo provides ignition switched 12v on the pink wire and the signal return to the speedo is via the red/white stripped wire. I sited the SGI-5 under the rear seat near where the cables go through the floor and just screwed it to the upright area of metal. With the seat base pulled up I can reach the unit from the drivers seat - this is important for calibration !
The SGI-5 has 4 separate output terminal options. To run a stock GTV6 speedo the signal out is taken from terminal labelled "OUT1". The angled photo of the unit in situ is deceptive, the wire definately comes from "out1" not number "out2" !
There are 4 dip switches, set switch 1 labelled "#1 input type" to "on" and the other 3 "off". The speedo will now work, but likely read wrong, maybe wildly wrong!
To adjust the reading SGI-5 has coarse and fine tuning, I didn't bother with the coarse tuning, just used the fine option:
To the right of the dip switches are a tiny push to make switch labelled "Up", then two LED's and another tiny push to make switch labelled "Dn".
Drive the car at an rpm where you know the exact speed for your gearbox/wheel/tyre combination, and just press either "Up" or "Dn" until the reading is correct.
Thats it.
First option works for a transplanted 75 transaxle and sensor, I used the Dakota SGI-5 unit, which has a variety of settings to run pretty much any type of speedo on the market. If you use one set it up like this:
Only 4 wires are attached to the SGI-5: 12v Power, ground, signal in and signal out.
On my GTV6 the loom from the speedo provides ignition switched 12v on the pink wire and the signal return to the speedo is via the red/white stripped wire. I sited the SGI-5 under the rear seat near where the cables go through the floor and just screwed it to the upright area of metal. With the seat base pulled up I can reach the unit from the drivers seat - this is important for calibration !
The SGI-5 has 4 separate output terminal options. To run a stock GTV6 speedo the signal out is taken from terminal labelled "OUT1". The angled photo of the unit in situ is deceptive, the wire definately comes from "out1" not number "out2" !
There are 4 dip switches, set switch 1 labelled "#1 input type" to "on" and the other 3 "off". The speedo will now work, but likely read wrong, maybe wildly wrong!
To adjust the reading SGI-5 has coarse and fine tuning, I didn't bother with the coarse tuning, just used the fine option:
To the right of the dip switches are a tiny push to make switch labelled "Up", then two LED's and another tiny push to make switch labelled "Dn".
Drive the car at an rpm where you know the exact speed for your gearbox/wheel/tyre combination, and just press either "Up" or "Dn" until the reading is correct.
Thats it.