Well...., I looked around in the arcives and did'nt find any info about putting in a water temp warning light.

A while back I burst a rotten radiator hose and warped the head. The thing is there was'nt any dramatic cloud of steam or any thing to alert me. I was driving along and the truck began losing power, I looked at my water temp gage (SR5 gage cluster) to see it was pegged!

I'm thinking if I would of had a big red light letting me know the water temp was at 200+f I may have avoided the damage.

I'm looking at a sender that's 1/2-14NPT, off at 170f/on at 200f. sender

So, the question is, where do I put the sender? It looks like there is a plug right near the thermostat neck.

Anyone do this before? Any suggestions?

I'm looking at the fitting just below and to the left of the thermostat neck.

The 22RTE truck had a thermo spout with NPT (or close enough) fitting built in. You could drill and tap them.
The downside is that if you don't have enough water flow, you'll read hotter than you are.. but that maybe good for your purposes.

Another alternative would be to use the existing gauge sender. As long as you have a high impedance circuit that you're using to drive your warning light, it shouldn't impact that reading on the gauge... You'd need basic knowledge of analog electronics.

Hmmm, my knowledge of analog electronics is a little thin....I'm looking for something in the realm of 'plug and play'

That's where I put the sender for my water temp. gauge, seems to work fine. Not sure what the thread size was, I have a autometer sport edition mechanical gauge. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Most of the sensor pipe threads are British Standard Pipe (BSP) threads. Between 1/16 up to 3/8, they differ by 1 additional thread over U.S. NPT. A NPT sender will screw into a metric hole for a few turns but will end up cross threading after 2 full turns. From the 1/2 NPT on up, they are the same threads per inch but the taper is different.

If a BSP to NPT (metric to U.S. NPT) adapter is not available, you can drill out the hole for the next size NPT and re-thread it then use a brass bushing if necessary.

NPT BSP
------- ----------
1/16-27 1/16-28
1/8-27 1/8-28
1/4-18 1/4-19
3/8-18 3/8-19
1/2-14 1/2-14
3/4-14 3/4-14
1-14 1-14

<img src="/forums/images/graemlins/kewl.gif" alt="" />

Thanks for the info <img src="/forums/images/graemlins/kewl.gif" alt="" />