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@dutchzcarguy Not sure if you Facebook but this came through my scroll today.

It wouldn't surprise me if it's an "off-the-shelf" piece that was used in creating the reproduction sending unit. And by "off-the-shelf" I mean that it is designed for a more recent car/electrical system, maybe even for LED lights. That would explain why the light comes on so soon for the incandescent bulbs. Unless ZCarDepot has someone as thorough as the good Captain when specifying the behavior for the reproduction, a thermistor with the wrong curve could have been used.

you would prob want to get a WW pot, those cheap carbon track pots would not like the current. I think I have some 100 or 500 ohms ones laying around if you cant get the fix with the different bulbs.

That thought popped in to my head too. Maybe use the fuel tweaker trick on your fuel light. A potientiometer (isn't it actually a rheostat, as it's used?) that you can tune until you get what you want. http://www.atlanticz.ca/zclub/techtips/tempsensorpot/index.html

The thermistor has to have enough current flowing thru it to heat up. To low a wattage (high resistance bulb)and it will not heat up, how low wattage is to low is something the engineers can answer if they had the specs. Here is a good example, if you read the voltage at the light socket with a reg VOM or DVM you will likely see 12v, as there is no load on the circuit. Put a load on it like say a test light and the voltage will drop, not zero but some, bigger load bigger drop, as the voltage drops at the socket, more current is flowing thru the thermistor, submerged I doubt it would ever heat enough to change it resistance (lower). its a very analog setup so you may or may not see the bulb of a test light come on.

Here is one set refinished: Keith

Maybe ambient air temperature is contributing. Warm fuel and all...

So true. Additionally, I am noticing the BaT audience now expects walk-around, cold start and driving videos of vehicles on the auction site. There's a yellow 1971 240Z on BaT right now accompanied by a nicely produced video narrated by a fine English gentleman. If I ever sell my Z, I may have to hire Richard Attenborough to do voice work to get the best price ?

just redo an S30 with an updated inline 6 and be done with it, and buck the trend, make it standard shift. Another old fart putting in my 2 cents. If it looked like that I would more likely buy a 1gen fastback mustang body and make my own car. At least you have an endless supply of parts that way.