Had a new Jasper 5.7L engine installed In my 96 Silverado. The temperature gage reads at the halfway mark between 100 and 210 (I read this as about 160?). Scanner confirms engine is at 194 though. Multimeter confirms new coolant temp sending unit is at 246 ohms. Replaced instrument cluster with a rebuilt unit because some of the other gages were a bit squirrelly too, but temp gage still reads the same. Suspect it may be the wire running through the firewall to the connector, but no idea how to get at the right pin to test it. Any thoughts on any of this puzzle? Thanks.