[Too Many Projects]

I have done this, but it's not pretty. I used brass fittings to look a little better.

Use a nipple into the intake with a T standing on end for the mechanical probe to go straight down. The electric sender will screw into the side of the T, but if it is too long, you will need another nipple and a union for the sender to screw into.
This was on my Pete to run 2 different temp senders to activate the fan for summer/winter, but same principal. I had to switch the harness plug from the 160 to 195, but they both "read" the water temp all the time.