I have a rear camera because I can't see out of the back window...
How about a cylinder head temp guage..?
Amp guage...?
Analog BS meter...?
White noise calming meter to combat potential road rage..?
Old Chryslers had turn signal operation confirmation lights on the hood (or fender...can't remember exactly where...)to make sure you knew if your turn signals were activated and working...
How about an air pressure guage ?? Go ahead and install air horns with a Happy Tooter that plays..."I'm in the money...!!"
Just some 'off-the-top-of-my-head' suggestions...
Ages ago my Dad put air horns on the top of his Dodge van...
I am going to pick up a couple more gauges for my truck. I have spots for three. I already have oil pressure, EGT, and Boost on the pillar. These are going to go overhead, I was going to get fuel pressure, and coolant temperature. What should I do with the third spot? I have a ZF-5 so I dont think I really need a trans temp gauge. What would you put in that third spot?
Also I have hydroboost for my brakes so vacuum is not really important.
Oil temp. You should put an engine oil temp gauge there. Then you can keep an eye on the delta (difference) between the engine coolant temp and engine oil temp, nothin like watching your engine oil heat soak goin up a hill and then a healthy oil cooler doing its job by taking care of it and getting the temps back to close deltas.
Our tube type oil coolers are pretty good, not the most efficient per se but plenty reliable, not susceptible to clogging as much as a plate type oil cooler, which was used on the early prototypes of the 6.9s, and a more complex internal version used for the 6.0 and 6.4 PSDs.
But especially with a turbo adding all that heat to the oil, I think an oil temp gauge would be the best bet, to say,
@asmith, that’s what I’d put there.