st 205, st 205 temp sensors Options

[Benny]

i need help guys im down to the last problem with my swap.
so i finished the st205 swap and noticed the tem gauge go to H with in a couple minutes of idling. my first thopught was a air pocket which by the way we still think there might be air trapped in it.
but any way we swapped the coolant temp sensor and the other one right beside of it that i am not sure what it is called. the new parts are for a 94 mr2 3sgte they fit right in and plugged in but as soon as the key was turned to accesseries the needle barried itself to the H within seconds. (remind you before the sensor swaps it did take couple minutes running to go to hot)

any advice on if maybe sensors bad still or why it would go to hot so quickly even when the motor is not actually hot?