Without the use of a volt meter wotsit I’m limited to what I could check, I did however have my AC control out and found the VSS wire you mentioned I'll beg, borrow or steal I volt meter @ the weekend before ripping my dash apart.
I always thought the pod speedo ran from the analogue speedo..... As the kmph to mph conversion chip is on the analogue speedo yet the digi pod also displays the mph signal....?