The gauges shut down then come back on... - 1994 BMW 3 Series

I'd say you have a faulty thermostat, be it new or not. If your temperature gauge goes to cold as your engine is taking you down the highway, the thermostat is not doing its job. The temperature should never come down to below normal until engine is shut off...

sound like a poor ground connection to your battery or electrical system

Take a fuel pressure gauge for a ride --tied to wipers

See if your loosing fuel pressure when it quites ,or see if
that data is avail on scan tool

Some brands of pumps don't last long,so I heard & see from
other experts on here

I guess a relay for fuel pump could have a bad primary coil in it

Try switching them around-- to something else you don't need
all the time

sounds more like cable problem, have them check it or yourself. had same problem way back when with 65 chevy, loosened cable from wheel than tightened again & worked fine

Doubt it.
The same fuse for the gauge would handle the rest of the cluster.
Probably the sending unit in the tank.

This is a sign that the thermostat is sticking shut and then opening after the temp gets past a certain point. If the heat gauge goes to high and then drops down suddenly, this is the likely culprit and you need to replace the thermostat - again.

I have had them arrive from the parts store and be defective.

more than likely loose or bad ground wire

The fuel level sensor is bad. The tank will have to be taken down to replace the level sensor. There is little fingers on the resistor that wear down and loose contact causing the gage to read incorrectly.

use a timing light to test for spark
have spark: timing belt broken

What's your answer on this-Mr. or Ms. High Ranker???