348 speedometer problem

I have a problem with my 348’s speedometer. I’ve searched previous posts here but can’t find any that address my specific problem, so I’m hoping that someone can advise me.

My speedometer works intermittently. It never works at start up, but after two or three miles it comes to life, although it will occasionally drop out briefly after that. Following advice in previous posts I changed the sensor in the gearbox, but that had no effect.

I have suspicions about the multi connector in the engine compartment and have cleaned that, but again with no success.

Can anyone tell me which of the terminals in that connector are related to the speedometer, and what voltages should be present?

 

Thanks Ernie, I did do that but will have another look at it.

The fact the speedometer doesn't work for the first few miles and then kicks in suggested to me that the problem might be temperature related, but I'm at a loss to think of what might be affected by temperature other than the sensor in the gearbox.