Auber Instruments do have a gauge that you can monitor engine temperature ( metal not coolant ) via a sensor that you attach to a bolt somewhere - maybe themostat housing. Apparently gives a more accurate reading than relying on coolant alone. Similar to Aussie made Watchdog. Beauty of it is that it will detect overheating as result of blown hose, broken belt etc. My understanding is that if you blow a radiator hose & run out of coolant your temp gauge will redline briefly ( OK if you notice ) & then begin to fall back towards cold. Anyone please correct me if I am wrong.