a 70 Charger will have a temp gauge and need the little single prong unit for that gauge. You can not assume that the 72 motor was set up for the present application. Your gauge pod should look something this. Mine is 68 but is the same except for the ignition switch being moved to the steering column.

this is the sender you need

sorry bout the poor photography I am a novice
any way here is where it goes. You should have no trouble finding this sender it was used for many years on all engines.

thanks, and yes i do have the exact style gauge, and know i dont wanna sound like i new the 72 was for the 70 because i know better i am thinkin that the 400 motor i have possibly has a different water pump housing which is throwing this all off, i need to look into more apparently..thanks again

you should use a 70 style pump housing but as long as the hoses match the radiator, either will work you still need the small sender for the gauge.The casting should be drilled for either sender. 72 or 70 should work.

I believe I even had one that the small hole was on top.Just look for a purple wire at the front of the block with I believe an angled connector on it.Thats the single wire for the temp.Rocky

rocky he is putting a big block into a 318 car is the purple wire still in the same place?

ok , i see it now thanks a bunch , so the other holes where the heater hose nipples go and the bigger hole by the heater hose nipples goes into the housing they could be plugged if needed..and could you tell me whats the best way to remove the small temp sender ..again thanks joe

I am not much good with stuck bolts and such but heat and patience will prevail.

lol...i will kick it one way or the other , its coming out. anyways thanks to you all for your time and help on this simple but yet complexed problem i am working on, i shouldn't have any more issues on this .. , but i still need to know on the oil sender unit if i put one on the back of the block for the 70 charger gauge ...but is another needed for a light or not.... as i was a bit confused on that as part of it...again thanks to you all.......

Only one oil pressure sender is needed. A gauge takes one kind and a light takes a different kind. the big can type is the one you need for the gauge.

Yeah Ma used about the same lengths of wires and color codes also.The only time you run 2 oil senders is when you have Sgnal Sentry type dash like Imperials had.They had both gauge and light.Same with the temp senders.Imps had gauge and a hot light at least my69s amd 70s did.Rocky

the rule of thumb says 1967-1976 V8s with GAUGES A,B,E body use the bell type oil pressure switch, and the small brass temp sender...pictured here....industry standard part#s

OIL PRESSURE SENDER
AMPCO PS32, NIEHOFF AL133R,STANDARD PS59,ECHLIN OP6603, FILKO OP58X, BORG WARNER S330

TEMP SENDER
AMPCO TU22, NIEHOFF FF134E,STANDARD TS17,ECHLIN TS6178, FILKO 2030, BORG WARNER WT127

TSU

OPS