For honda's B-series motors they make an adapter that fits between the block and oil filter so you can mount oil pressure/temperature senders there. Do they make anything like this for the H series? I can't seem to find anything like that.

 

I'm sure someone does, but you don't need to. I'm using aftermarket oil pressure and temp gauges and they came with adaptors that screw right into the block, using the existing sensor hole.

 

yeah greddy makes an oil filter adapter plate. I currently have one on my h22 prelude.