Cullen - what happened to the Original Gauge ? Is the gauge or the sending unit bad ? Try Napa 0r AutoZone etc, for a sending unit . try www.car-parts.com I urge all on the gremlin list to join the amc_list as there are 'Experts' with factory books & tons of background on Gremlins & AMCs' . A few are shop owners & might have parts . see : www.amxfiles.com & follow the info to sign up for amc_list . Another thing is to find the TSM Technical Service Manual for your year AMC . I'll ask on the list . You might try MoPar - Parts 248-969- 1690 This is their Tech Line . You'll REALLy *### 'em up calling in about a Gremlin. These guys usually answer questions on Street Hemis' and such . I'd go with Original Gauges on the Gremlin just because they're cool to start with. Join on the list , Cullen....... there are at least two people who could help answer the wire codes & tests for the sending unit & gauge. ..............bt HH-7X@xxxx