TM with the old style display. $900
Autometer oil and coolant temp gauges $179
Autometer oil pressure gauge $204.
In my case I have a big oil mechanical oil pressure gauge instead of the above OP guage, but that creates some hassle in logging OP.
I also have a F/A meter and fuel pressure gauge on my dash. I put them in when I was in a death fight with engine management problems. Darn useful.
I’m less obsessed now than I used to be, so I’ve not set up my current car to log hardly anything. It’s predecessor was set up to log oil and coolant temps, F/A and oil pressure.
One thing I learned about logging sensors, during my obsessed days, was that the best way to do it was by using a gauge that had an output designed for logging. Trying to use the 5v reference source from the TM doesn’t work to well because you end up with a very small voltage range in your measurements. Like coolant temp at 50deg might be 2v, and coolant tempt at 200deg might be 3v. That’s too small for accurate data.
I was kind of obstinate re. the mechanical oil pressure gauge. I was determined to keep it yet also find a way to log OP. Ultimately I bought a little “voltage regulator on a chip” that could input a range of voltages and output a very stable, I dunno, 18v or something. That allowed me to create a signal range of something like 0psi was 3v and 70psi was 12v. That was a large enough area that the data was reliably accurate. Had I not been so obstinate I’d have just bought a Stack/Autometer OP gauge.
The folks that have those dash replacement systems do seem to like them, but I still think the idea of broadly sharing data is the most significant issue. A secondary issue is that if lots of people are using the same system, you won’t have any unique problems. Any of the systems can be made to work. A price delta of $1k seems like an awful lot of money, but a single race can burn thru that. So I’d get whatever the other guys are using.
The guys I know that have dash replacements are Rich Bratton and Jim Levie. They’d be happy to provide insights I’m sure. You can send them an email via the Members link at left. Don’t PM them, they aren’t on the site often enough. The guys at BimmerForums\Track subforum also might be a good resource for info.