I bought my first boat, a 2001 Rinker 192 BR. Originally it came with a 5.0 GM Merc Serial # 0M066428, but repowered to a 5.7 GM. I believe they used everything off of the 5.0 and swapped it to the 5.7.
My temp sending unit for the gauge is located on the starboard side of the thermostat...