I hope the hardcore get into this--but being an aviation enthusiast, there are cylinder head and exhaust temp gauges made for the moitoring of each individual cyl in one gauge.
The choices run the gamut--but the best lookin ones are the analog ones.
In one gauge face there are four identicle gauges for either head temp or exhaust temp. For the heads, a special thermocouple was developed that actually take the place of the sparkplug washer, therefore reads the temp directly from the sparkplug, ( arguable the hottest point) these are precision instruments that are certified for flight, and man do they look cool!!!
A good thing is they thread onto the sparkplug threads, so when done carefully, u-can easily replace plugs w/o fumbling for the thermocouple.
The exhaust ones look identicle as far as gauges go to the head temp , they just require a bung welded to each pipe and the traditional thermocouple inserted into the exhaust stream.
Best of all you can get these for less than a couple hundred bucks.
look at the following websites"
www.aircraftspruce.com
www.wicksaircraft.com
Not to mention these are sick-ass looking when installed in your ride...