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Temp gauge

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    Temp gauge

    So just got the 88 M3 running after it has sat in a barn for about ten years. After reaplceing all fuel lines and pumos and all electric wires/cap/plugs etc everything is good except temp gauge on dash only comes up into the mid blue range. Is it a sensor thing or gauge. How do I trouble shoot the temp switches. I see on Real oem there is one in the radiator and two in the lines. Which one connects to the gauge and if I ground them out should the gauge go the far right kinda like a gas gauge?. Any help?
    The Lineup in order of appearance:
    91 535i
    91 318is 5 Lug/E46M3 Brakes
    91 325is w/ S52
    88 Vert Plastic Bumper Swap
    88 M3 ;D
    91 325ix 5 speed
    89 Vert Royalblau Metallic
    73 2002
    1986 325es --> is swap Rallycross Car!!
    1995 Chevy G30 Tow Rig... *I SOLD A CAR!!*
    1993 525i Granitsilber Metallic Touring

    Need a 91 M5 bad but wife would shoot me...twice

    *UPDATE: got a 93 M5 and still alive

    1972 Jeep Wagoneer
    1975 2002 five speed

    Check out:


    don't know what your issue is but the single wire sensor in the coolant pipe is connected to the temp guage in the instrument cluster. I would probably start there, cheap enough of a part and first hand experience of one failing.

    1988 M3, 97 840, 99 XJ