Temp Sensor and Mechanical Oil Pressure Line

[wayno]

I ordered a new temp sensor for my 327 and it arrived today and it fits in the intake - however I'm told that it's better to utilize the spot in between 1 & 3 on the head itself - now it appears that the hole is a bit smaller and this sender won't work there. Anyone have a part number for a sender that will fit in that location?

Next question: Is there a benefit to having the mechanical oil pressure line run to the back center of the block versus down on the side of the engine by the oil filter?

[jtrichard]

is yours a temp light? or a gauge?

[wayno]

It's a gauge and this is the one I have now...

http://www.napaonline.com/Catalog/Ca...9SB_0149945501

[wayno]

One more wrinkle... electric fan - so I'll assume I'll need two types - one for my gauge and another for the fan? o

[ray_mcavoy]

Sounds like you have later model heads with the smaller 3/8" NPT hole.

I'm not aware of any temp senders that have 3/8" NPT threads and the correct resistance range to work with the factory temp gauge. There is a Chrysler sending unit (Standard Motor Products #TS-131) that has small 1/8" NPT threads that could be adapted to 3/8" NPT with a bushing. It has a similar temp vs. resistance curve to the OE GM sending unit but it's not exactly the same so your results may vary.

You might want to reconsider using the intake manifold for your gauge sending unit and using the cylinder head location for your fan switch. The intake manifold is the stock location for the temp sending unit on most 1967 & older Chevy V8 engines anyway. Here is a good write-up that discusses the differences in the intake vs. head temp sender locations --> http://www.madelectrical.com/worksho...p-gauge2.shtml

[jtrichard]

you might be-able to get a 1/2" tap and tap the hole in the head to 1/2"