I wish to monitor my engine’s temperatures, what sensors can I connect to a TMP100?

Matretron’s TMP100 has two high temperature channels uniquely designed for K-Type Thermocouple solutions. 

There are many applications the K-Type thermocouple sensor is well suited for such as Exhaust Gas, turbo charger charged air temperature, and Exhaust Manifold. A sensor can be located online by simply searching "K-Type". Here are some images of K-Type thermocouples you may find online:

• Sealed waterproof threaded probe ideal fro boiler tank monitoring.

• Ring probe sensor, I deal for non-invasive thermo-transfer monitoring.  

• Bolt style sensor 1/8" NPT, ideal for surface threaded monitoring.

• Flange style immersion sensor probe, ideal for sealed applications.

• See here in figure 1 the monitoring of hot exhaust gas fore each engine cylinder .