Trans guage wont work....
As for the flip flop of the gauge...check your power and ground connections REALLY well. Autometer gauges can also act alittle funny if you connect them to a power spot with other things. Same way with the ground. I have 10 gauges in my car. 9 of them are autometer. I have them all on their own little power circuit, and used big wire to hook them to ground. No problems. But the flip flop sounds to me like a bad connection somewhere...or a "dirty" power/ground solution.
Justin

