Temperature sending unit.

[tauruck]

We bought a radiator to use in our ice water tank for the long car.

It has threaded opening for the OEM temperature sending unit.

Should I plug it and use the one on the block or use it?.

[saltwheels262]

what about using both of them ?
to sending units and 2 gauges.

[Stainless1]

Yes, you just as well have 2 gauges that you will not have time to look at as 1 

The one in the ice tank radiator doesn't tell you a lot, to watch, but you might want both going to data depending where the radiator one is.

[redhotracing]

I wouldn't use a temp sensor in that position, instead plug in a sensor at the
hottest point of the system (pre-radiator) and then after (at or pre-block).

Like Stainless eluded, you probably won't have time to watch both, but it
may be helpful in data acquisition. The "post" level is what's really important
but it's nice to see how well the cooling system is working.

We use the same thinking with boost (pre-intercooler & post-intercooler)...
We pulled boost reference before the IC, after the IC, and post TB to gauge
where it really is during dyno pulls, then use the intake port for racing. That
has usually been the most equalized under load (16 psi on the track vs. 19 psi
on the dyno). Without data, you're just another guy with an opinion 

[tauruck]

Thanks guys.

I was thinking that having a unit in amongst all the ice that will be packed into the tank could be a problem.

Keeping the wiring out of harms way is a concern and will probably get damaged.

I'll build the tank first and see how the radiator fits etc then I'll post a few pics so you can see what it looks like.

[wobblywalrus]

It can give you some good info during the development, testing, and tuning.  Then you can take it off for the race.

[tauruck]

The sending unit screws in at the bottom of the radiator so I'll be able to keep it out of harms way.

Getting a unit next week.