I just went to install external relays on my Electronize. I dont get any potential voltage from pink to yellow. The relay is still turning on from pink to green.

The relays I used have a diode in them. Could this have damaged the speedo?

I have killed two and have two more. I cant afford to make another mistake or I will have to wait months more while I post the speedos away for another repair.

Does anyone have any ideas?