5.7 water temp sender

[akamoonman]

Im attempting to find water temp sender for my 5.7 GM 350 V8 disign 1. My issue is that there are 2 senders or sensors on the thermostat housing. The right side has 1 wire attached to the sender and a black ceramic looking object on it. The left side has 2 wire attached to it and i believe the part is 806490T. can i replace both sender using the same part. im so confused at the moment.

 

[Bondo]

Ayuh,...... Welcome Aboard,...... One of those 2 is the temp sender, for the gauge, it senses varyin' resistance to ground,....

The other one is a temp switch, for the alarm system, which is a make, or break switch,....

Post yer motor's serial number, 'n one of the boys will probably look up the part numbers for ya,....

 

[akamoonman]

Thank you for the welcome.
Il check out the serial number this evening and revert tomorrow with the info.
Thanks again.

 

[akamoonman]

I know it is a 1991 Mercruiser 5.7 with a 350 V8 GM motor 4 BBl carb.
However I will look for the manual tonight for the SN Number