The coolant temp gauge on my HPC is not reading correctly. The gauge is reading about 70C but the infrared pyrometer indicates 90C. I'm trying to figure out how to trouble shoot to find out if it is the gauge or sender, so does anyone know what the range values should be for the sender and VDO temp gauge. The temp senders are cheap so I do not mind replacing, but not sure of the cross reference for the part. Is it just the standard temp sender off a Vauxhall calibra?