Hi LKM,

Swoop223 has giving directon of how to test the sensor and yes the temp at the maifold will be much higher as that is where the combusion gases exit. LP trucks do have higher temps than regular Diesels. The Engine Oil Pressure sensor is there as a safety device to stop the engine, if it thinks there is risk of damage, so it is either reading something being wrong or it is not working correctly.

Note that Combilift have tech support beside you in North Carolina in Greensboro along with a Parts Hub. If you complete the "Technical support" form at the bottom of the www.Combilift.com web site, then one of the team will be in contact with you.

Hope you get sorted.

Thanks,
Richard