I need to have two sender units, one for the guage and one for the electric fans. Which should I put where???

Here's what I have available:

1 port in the intake near T-stat.
1 port in each head
1 threaded port in the "return" tank of the radiator (up high on the tank, not sure if this is meant as a "low coolant", about 4 inches from the top, roughly)

I could also get the "fin probe" for the fans (or place in the radiator hose?)


I realize the temp at the cylinder head might read higher, especially at idle/lower flows. I don't really like the idea of the T-stat housing with a bung, but maybe a spacer under the T-stat???

Thanks

I need to have two sender units, one for the guage and one for the electric fans. Which should I put where???

Here's what I have available:

1 port in the intake near T-stat.
1 port in each head
1 threaded port in the "return" tank of the radiator (up high on the tank, not sure if this is meant as a "low coolant", about 4 inches from the top, roughly)

I could also get the "fin probe" for the fans (or place in the radiator hose?)


I realize the temp at the cylinder head might read higher, especially at idle/lower flows. I don't really like the idea of the T-stat housing with a bung, but maybe a spacer under the T-stat???

Thanks

If you have room I would go with the idea of the T-stat housing with a bung, but maybe a spacer under the T-stat???

summit or jegs sells a t/stat housing threaded for a sensor .. I would run the fan sensor there .

yes the port in the tank of the rad is on the cool side of the rad 40 Degrees cooler after flow threw rad ..and ment for a low coolant sender .. dont use it for temp gauge or fan sensor .

Don

I like the thermostat crossover location for gauge sensors as it provides the best overall picture of that is going on in the engine.

After that fan sensors can go just about anywhere so long as the temperature ranges are coordinated.

Using the radiator tank is really not a bad place and a number of OEM designs have been setup that way. As I look at it, you really only need the fan to turn on when you have insufficient cooling across the radiator and what more direct way to sense this than coolant exit temperature? You may have to do some research here to come up with the right temperature range though. Infrared temp gauges are not too expensive and fairly common if you know where to look (the RC car folks like to use little ones ;-) ). I picked up one to map temperatures across the radiator just for a better understanding of how my electric fans were or were not working.

We still need to get together and do some electric work don't we? :beers: