You may want to get a UltraGauge so you can continuously monitor most of the things going on with your truck. (Not transmission temps though)
I have one and I monitor alternator output, engine temps, and O2 sensors most of the time and I can diagnose an issue before it's a problem.
Oh, that's on my list...I really like that set up but it's $150 I can place somewhere else right now...so, it'll probably be a VDO type gauge for the time being and then update to that lovely little gem of a tattletale.
Did you place yours at the steering wheel or in the dash spot where the cup holder is (in some of the 80's)? I've been told that small little pocket just above the stereo is perfect for that gauge.
Thanks,