Voltage checks as requested in post 97. Wasn't sure if I had this right so I gave you every combination I could think of.
13.88v actual input voltage measured disconnected
45.7 K Ohm resistor measured disconnected
With 45.7 K Ohm resistor between ground ans speedometer input
0.518V Votlagae across speedometer input and ground
13.37V Voltage across speedometer input and +power
13.88V Voltage across + and -
With 45.7 K Ohm resistor between +13.88V and speedometer input
13.72V Votlagae across speedometer input and ground
106.3mV Voltage across speedometer input and +power
13.89V Voltage across + and -
13.88v actual input voltage measured disconnected
45.7 K Ohm resistor measured disconnected
With 45.7 K Ohm resistor between ground ans speedometer input
0.518V Votlagae across speedometer input and ground
13.37V Voltage across speedometer input and +power
13.88V Voltage across + and -
With 45.7 K Ohm resistor between +13.88V and speedometer input
13.72V Votlagae across speedometer input and ground
106.3mV Voltage across speedometer input and +power
13.89V Voltage across + and -