I am still thinking that maybe the gauge is reading high because these cars originally had cooler thermostats. I know my old 200 had a 160 or 165 stat in it before. I am wondering if going up 20 or 30 degrees actually makes the guage read that much higher.
If this is the case is there a different sending unit that I can use?
The thing about the aftermarket gauges is that there are already far too many wires that didn't come factory. I don't want any more of a rats nest. Thats part of the reason we don't have any aftermarket gauges except a tach.
I'm trying to figure out how getting an early start will increase radiator efficiency. Do you have a rigid fan? Clutch? Electric? Fan shroud?
Getting an early start on cooling would help only if you only drive short distances. After that, you're done. Try a 190° sometime. Oddly, it sometimes helps the engine run cooler. Something about the temperature differential of the coolant in the radiator vs. the ambient air. I'm not very good at thermodynamics, though.
IMO, accurate gauges are really much more important than a tachometer in a street driven car. I look at my oil pressure, water temp and voltmeter more than I ever use the tachometer on the street.
As for rat's nest, use cable ties or those plastic coil ducting they sell at parts stores.
You don't have to mount it permanently, only hook it up for as long as it takes to solve your worries about the factory gauge. Cheap insurance if you ask me. Plumb both together using a "T" fitting so they're both reading off the same point in the coolant flow. Then remove and restore it all back the way you want when you're doneThats just it though. My car has the dealer add on under dash AC, GT fog lights, some stereo stuff, a tach, and a couple other small wiring modifications.
I have used cable ties etc. There just isn't room under the dash for all the wiring. Also, I would have to run more wires through the firewall, which I really don't want to do.
I also don't have any place to mount a triple gauge set. I need some of the small 1.5 inch ones. Seconly, I don't like how any of the triple gauge sets look. I would want a set that matches my tach, which is vintage style.
Here is my tach.
Make Waves Instrument ILLUMINATED TACHOMETER 0-8000 RPM 2 : JC Whitney: Auto Parts & Accessories
Does anyone know of a mini triple gauge set that matches the style of my tach and is volts, oil, temp?
You don't have to mount it permanently, only hook it up for as long as it takes to solve your worries about the factory gauge. Cheap insurance if you ask me. Plumb both together using a "T" fitting so they're both reading off the same point in the coolant flow. Then remove and restore it all back the way you want when you're done
I have a vacuum gauge mounted inside of my engine compartment. I had it mounted under the dash, but for some reason, the plastic line always got too brittle inside of the car rather than in the engine bay. Figure that one out.
And this has to do with what ?
We discovered something interesting today. We took some values of resistance in boiling water and different temperatures with the sending unit. We then duplicated them with a POT and got the gauge to read somewhat normal. When the car is running it reads higher than this. Why would it read high with the car running? Interference from something?
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