Anyone know the inner diameter of the rubber hose leading off the radiator?

I'm purchasing a radiator hose adapter for a water temp gauge. I don't want to take the hose off and lose coolant before I install so I figured I'd ask if anyone else knew?

Here are the diameter adapters I can choose from.

28 Millimeters = 1 1/32" (most Honda's)
30 Millimeters = 1 1/16"
32 Millimeters = 1 1/4" (Celica)
34 Millimeters = 1 3/8" (Supra, Chevy's & Cobalt SS)
38 Millimeters = 1.5" (Subaru, Hyundai & RX-7)
If you measure the outside diameter of the hose subtract 6mm for the wall thickness

The inside diameter of both the hoses between the pipes and radiator on my 88 L4 are 1.25" (32mm).

quote Originally posted by spark1: The inside diameter of both the hoses between the pipes and radiator on my 88 L4 are 1.25" (32mm).

I forgot to mention it's a V6 fiero. The rad hoses should be about the same though right?

The metal the hose slips over, not counting the "barb" is 1.3 inches. Larry

I think all Fiero radiators are the same, at least the aftermarket ones are. The inside diameter of the rubber hose is 1 1/4" but the outside diameter of the radiator inlet/outlet is slightly larger, 1 5/16" .