Now on page 8E-4, here's what it says about the tach:



Now it says on the same page that the speedometer receives its signal right from the VSS, so the speedometer is independent of the PCM. What it doesn't say is which wires do what on the speedo.

 

My bunny rabbit has been bad the last few days, she's chewed though 3 mice cables and chewed up the speaker cable...

Bad bunny...

 

^Uh oh... Boy stewie, I didn't know you had so many pets...

 

White wire with orange trace is VSS input signal. So far as I can tell, that should be the only wire you need to make the speedo work.

Three wires at VSS:
Light blue: Sensor ground
Orange: 5 volt supply.
Both of those are to/from the PCM

White with orange trace: Signal wire. This has a splice that also goes to the PCM. Probably for cruise, and a couple other purposes. (trans for instance....)

 

So which pin on the back of the speedo is signal, and which is ground?

 

Shouldn't have to do anything on the back of the speedo, so long as all the wires are still in the connector for the cluster. Just make sure you are getting 5 volts to the sensor.

 

Well that's the problem, I will be running a custom cluster, so while I may be able to use the factory speedo, I might not be able to reuse the PCB on the back.

 

Trial and error then. The speedo will work either way, I should think. Just the odo may run backwards.

 

This came into the shoo today. Holy bondo barman!






Pics don't do it justice. that dent is about 2.5" deep. And they were going to just fill it.

 

Your pic no work.