Personally, I would do some problem solving/checking before replacing with a multimeter. If you just want to replace it, then it is probably easier to buy an EGT gauge and change the whole lot (they usually come with a new temp prob)the needle never moves. So I figure it is no good?
So your question has me even more confused. Lol. This guage appears to come directly from the hole in the engine pictured, through the fire wall, and to my dash. No other power wires going to it. Should this guage be drawing power from another source? How does that hole in the engine create power to test with a multimeter?Personally, I would do some problem solving/checking before replacing with a multimeter. If you just want to replace it, then it is probably easier to buy an EGT gauge and change the whole lot (they usually come with a new temp prob)
Power could be for a light on that gauge. Usually the probes work, or they don't. If you don't get any reading it could be probe or gauge bad.
I would just unbolt the probe, then you will know what the thread is. Usually 1/8"npt is pretty standard. Choose whatever gauge you like. Usually the cheaper ones break quicker and less accurate. VDO, Autometer, IHI are good gauges if you want to go standard dial style.
I have a dual Auber gauge like @relaxedcruiser is talking about. Good gauges, fast and programable alarms warning lights. Auber also makes a round gauge, it's just not analog like most gauges. But that square digital looks fits in nicely in my 1988 BJ74.
The digital Auber guage would require an additional power source correct? Do they work with 24volt? May stick with analog for ease of replacement since I currently do not have power running to that guage.