I don't know what you're doing with it but you don't need anything added for it to do it's job. My old crewcab doesn't even have a tachometer to make sure there's not too many tachs. Nowdays, even a friggin Honda Fit has a tachometer. What the hell is up with that? What possible benefit is derived from knowing how fast your engine is spinning? How fast should it be spinning? My wife's Pilot has a tach. What did that cost? You just put it in D and drive it. What the hell is the tach for? Gauges are even more stupid than idiot lights. They make you keep looking at them when you should be watching the damn road. People have developed this thing about gauges.
The only useful gauges in my tow vehicle are the fuel gauge and the speedometer--which I don't really use because I'm distracted by my GPS. The rest of it is just crap that makes us feel like airplane pilots. I have a boost gauge and EGT, but I never look at them. I never look at the oil pressure, coolant temp or volts. I'd rather be like a military truck and have a speedo surrounded by a battery of big fat idiot lights. My chainsaw, pushmower and string trimmer have no gauges. It's because you don't need them. When your friggen radiator hose blows, your first indication won't be the gauge needle. It will be all that steam blasting up through the grill.
Why do you think they call it an idiot light? It's because if the bad shit happens and it takes a light to alert you, you're an idiot.
A gauge is like an ultra idiot light. It won't alert you to anything. The steam blasts up through the grill and then, like a complete idiot, you look to the gauge to see if you are overheating.
Damn the gauges!