I think the manual said the speed alerts are 2km/h difference... But all cars are different from small changes. My dash speedo is 2 k's out, and given that it's technically digital (read: not mechanical), then i would assume the speed alert is the same.
Unfortunately no to the pictures. If you know some basic electronics though, it's pretty simple. However, If you can't get yours to work by pressing the buttons, then this won't work. What the following instructions do is complete the circuit, as if you were holding down the buttons. The resistor is just to ditch that annoying led.
Try: Ignition off, hold down up and down, start car, release buttons.
That's how my mates worked, so that's what I'll base my explanation on.
The usual disclaimer. If you fry anything it's not my fault, and more importantly, not my problem. Read on at your own risk.
Pull the speed alert to bits, it's pretty clear how to do that after you've taken it out of the dash. At this point, we used some filler in the speaker, led and button holes, so we were left with a plain face and nothing but the backlit screen. You're left with a PCB with the screen/buttons/LED attached... locate the two buttons that had to be held down and either:
Cheap method: Glue/blutack/hold them down somehow... maybe make them press against the case when you put it back together.
Better method: Pull the push button switches off and solder the two pins together... or use a bit of wire. This is what we did.
You can just rip the center button (SET switch) out.
You have a few options from here. You could possibly just remove the LED, but i don't know if the circuit relies on it being in place... so we put a small resistor in there instead. Again, simple soldering. A standard diode would probably work too. Or, again highlighting a cheap method, you could just cover it up.
If you want to get semi complicated, you could wire up a switch that lives somewhere on your dash, which bridges those two buttons and swaps the LED to a resistor, so when you flick the switch before startup the digital speedo is displayed... And if you disengage the switch, and press the set button, it'll work like a normal speed alert. But if you really want to go to that much trouble, buy a newer commodore.
