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I have recently installed a six gauge set of AutoMeter electronic gauges in my 66 short box 4 whl drive having the 300 cu in L6 engine. I used the Haneline engine turned dash insert. Beautiful setup. All gauges are working great except the coolant temp gauge. I now have the sender in the wrong place,(in the thermo housing on the radiator side of things which of course gives me a low reading). I am running a Clifford four barrel water heated intake. Where is the best place for the sender to be located?
I would have installed it in the same location as the factory sensor was. You might have to go down to your local parts store and buy some fittings, as I imagine your new auto meter sensor is smaller in diameter than the factory unit was. Regardless they are common pipe fittings. Just make sure to use pipe tape on it when you install it or it will leak coolant. I have not worked on a six in a few years so I forget where the factory sender was but that is where I would install it.
The 300 has the temp sensor on the block, right side, just below the head mating surface.
Interesting that your temp is reading lower. On my truck, I have both the stock gauge & an aftermarket; the stock gauge reads from the thermostat housing & the aftermarket gauge reads from the block (stock sensor location). I had actually switched them back & forth to get an idea as to what the real temps were (under the assumption that the aftermarket gauge is a little more accurate) & ended up just leaving the stock gauge hooked up at the thermostat housing. If anything, the thermostat reading is a little higher, once the thermostat opens (I've had a few stuck thermostats, so I've left the sensor in place to keep an eye on it).
Edwin