I also had a 28 cigarette the had two of the standard cooler adapted to the plate that bolts to the transmission. It made it a double pass thru system. Worked well I never had any problems with those transmissions and I owned that boat for 11 yrs and ran it hard.

man, I have 14 gauges (16 counting tachs) but no trans temp or pressure. Out of space and money.

do you tap into oil reservoir. I wouldn’t think measuring water temp out of cooler would be accurate?

I'm not using the gauge to measure water pressure . I'm have a gauge for measuring oil pressure and a gauge for oil temp. I put a sender where the drain plug would go and there's a plug on the back of the transmission you can use to run a pressure gauge.

Keep an eye on temps. The Gatling gun style cooler is an excellent investment. Or if your good with copper you can make your own and be much further ahead than stock. One of their weekest links is cooling. I might have missed but make sure you run your hose directly from raw water pump port.

KC Marine is who I believe I purchased a couple from about 4-5 years ago it seems however having difficulties finding same site. Not sure what happened to them or if they are still in business. I thought the owner or employee use to be an active member here. Might be mistaking though. Thought for sure I'd be able to pull up a pic of one on the net but with a quick search I couldn't. The pic here is just an example of kinda what they look like only bolt in as a direct replacement and externally look the same where they bolt in. Maybe put place in wanted section. Someone will have one on here. I sold mine couple years back. Again this pic is just an example of what I'm refeering to.

I heard Kirk from kc marine past away that's way the sight is gone.