Re: New gauges - wiring question
Looks like you have a crate motor with vortec heads, likely a newer block. The tapped hole in those heads for temp sender is probably smaller than what was used in the late 60's, so you'll likely need to use a spot in the intake manifold for that. Depends on the thread size of you sender.
For an additional oil pressure sender, look at the driver's side of the block, just above the oil filter. You will likely see a hex head pipe plug installed there. If so, you can install your oil pressure idiot light sender there. You will need a commonly available bushing to adapt the existing hole to 1/8" national pipe thread, and you will need to extend the wire to reach it. (I'm not sure if this spot would give the same reading as the one by the distributor, but certainly a good place for an idiot light, which turns the light on when no oil pressure is detected)
Then you can install the sender for your new oil gauge by the distributor without the plumbing mess of a T fitting.
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