tdenkler Posted October 3, 2014 Share Posted October 3, 2014 Fellow Jeep Comanche lovers: Does anyone know if the 87 Comanche had dash tach as an option? Can I install dash with tach from an 84-90 and make it work? Without an engineering degree? Mine has no tach and idiot lights. Dashes with tach have gauges. I assume they require different sending units? Appreciate any help. I'm sure someone has done this! I hope! How many ponies did the 87 4.0 have? Thanks, Tom Denkler tdenkller3853@earthlink.net Link to comment Share on other sites More sharing options...
Eagle Posted October 3, 2014 Share Posted October 3, 2014 87s in the Base trim level had idiot lights. The Pioneer got gauges standard, with a tachometer optional. The Chief (I think) had both gauges and tachometer as standard. The instrumented cluster is a bolt in conversion -- no wiring necessary. You do have to replace the temperature sender and the oil pressure sender with the appropriate senders for gauges. The trick is that Jeep used two different clusters with the mechanical speedometer, and I believe 87 is the cross-over year. The early ones did NOT have any way to adjust the tachometer for number of cylinders, so you have to be careful to get one from a vehicle with the same engine you have. The later ones have a potentiometer on the tach that allows it to be calibrated for the number of cylinders. Also, the speedo cable attachment to the speedo head is different between the early and late styles. Link to comment Share on other sites More sharing options...
thejim42 Posted October 3, 2014 Share Posted October 3, 2014 Sure was! Its easy to install a factory cluster with a tach Link to comment Share on other sites More sharing options...
cruiser54 Posted October 3, 2014 Share Posted October 3, 2014 173 horsepower in 1987. Want 182 horsepower? Install an 89 to 90 ECU. Link to comment Share on other sites More sharing options...
garyweb3 Posted October 4, 2014 Share Posted October 4, 2014 I also have an '87 but with the 2.5. I picked up a guage cluster a while ago but haven't got around to installing it yet. My question is: it presently has after market guages(temp,volts,oil) and tach. Will the after market sending units work with the factory guages? Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 4, 2014 Share Posted October 4, 2014 Every electrical gauge uses a sender matched to deflect the gauge indicator needle across the scale by sensing a calibrated ohm value at any point of the gauges scale. IOW, the senders ohm value table is matched to the gauge. It's very doubtful the aftermarket senders will work with factory gauges so they read correctly and vice-versa. Link to comment Share on other sites More sharing options...
garyweb3 Posted October 5, 2014 Share Posted October 5, 2014 Thanks,hornbrod. Link to comment Share on other sites More sharing options...
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