The airplane guys have what you're looking for.
4-cylinder and 6-cylinder versions. Cylinder head temp, exhaust temp, oil temp, fuel flow, yada yada.....
Of course, probably more than you're looking for. Do you really need to know each cylinder's head temp? Do you want to run probes to every head and exhaust port?
https://www.jpinstruments.com/shop/edm-700/