What does this port access?

[JJK]

I have a BPE347Fi, which is built from a SBF302, and using the RF harness with a Mk4 (delivered end of 2022). I am looking for a good spot for the water temperature gauge sensor, and believe that the port marked 1 on this picture is acceptable. However, there is another port on the bottom of the block behind the oil filter and closer to the front, marked with 2. What does this port access? Can i use it for the water temp sensor for the gauge. It is more convenient and more hidden than the one behind the distributor on top.

183612

Additionally, since none of the three gauge sensors in this bundle (oil temp, oil pressure, water temp) include provision for a ground, can I just gang the three ground wires in this bundle together and ground to the frame by the sensors?

JJ

[Jeff Kleiner]

1 is coolant temp, 2 is oil pressure. Ideally oil temp should be in the pan.

Jeff

[JJK]

Yes, you are correct, I remember now. Any other options for water temp sender location? And can I gang the three grounds together?
Thanks
JJ

[Ford & Jeep Fan]

It would really be better if you put the coolant temp sensor up higher on the engine. the lower you go on the block the less circulation you have. OEM on 5.0L 80s Mustangs was in the heater hose.

[Norm B]

There should be another port on the other side of the intake just behind the thermostat opening that would work for coolant temperature with the proper adapter. This port is normally used for the heater hose supply line. Some intake manifolds have a rear coolant cross over and two addition ports in it. These are not recommended for ECT sensors because the coolant is much cooler there.
Not understanding your question about grounds. One wire sensors ground through the block and 2 or 3 wire sensors should have the proper connectors to attach to the harness. The instructions with your gauges should provide information on this.

Norm

[weendoggy]

And can I gang the three grounds together?
Thanks
JJ

Yes. If you have a two-wire sensor, I'd run them all toward the rear of the block and ground there. Just depends on how you want your final project to look.

[Alec]

Yes. If you have a two-wire sensor, I'd run them all toward the rear of the block and ground there. Just depends on how you want your final project to look.

My 2-wire senders are all grounded thru the gauges.

[JJK]

My gauges are Autometer Ultralite and all three senders (oit temp, water temp, oil pressure) ground through the threads per Autometer's instructions, they only require one wire from the RF harness. But bundled in the RF harness with these sender wires are three additional black ground wires. The Autometer instructions say to ground the gauges close to the senders, but in actuality they are all grounded via the RF harness instructions. So, I was unsure as to what these additional ground wires are for, perhaps for two wire senders? Anyhow, I think it safe to assume to just ground them out of sight in the engine bay.

[drewr]

There should be a port behind the thermostat in the water neck going to the radiator hose for the water temp switch. The port you have labelled "1" is for the heater return hose. If you have the Ron Francis harness and the GPS gauges with the 3 wire oil pressure switch, you need all three wires to make it function correctly. You can either use the included send wire for the oil pressure switch or use the Ron Francis harness. If you use the harness, you'll have to splice in the connector from the included send cable and trace back to the gauge to make sure which wire goes where. I think I used the oil temp wire in the harness to act as the third wire and spliced to the connection at the gauge. Clear as mud, right? Hope this helps.
Drew

[drewr]

Oh, you have the Autometers. What I said is for the GPS gauges.

[Jeff Kleiner]

And can I gang the three grounds together?



Absolutely! As my professor in college drilled into our heads 45 years ago..."Ground is ground is ground is ground is ground..."

Jeff