Pete Lewis Posted August 31, 2021 Report Share Posted August 31, 2021 121997 and gtr108 are identical in shape and fitment just the resistance is change to suit non stabilised systems the colour of the insulator might change from memory there are red green and black from memory 997 green 108 black Pete Link to comment Share on other sites More sharing options...
Steve P Posted August 31, 2021 Report Share Posted August 31, 2021 And don`t forget the large variation in quality of crap new parts,as i found recently when experimenting with my 13/60 which showed the temp gauge at 3/4 at normal running.(new engine). Testing the resistance of 2 new 108 sensors from different suppliers showed resistances of 880 and 560 ohms,one gave the 3/4 reading,the other shows 1/3 on the gauge,guess which one i left in there. Steve Link to comment Share on other sites More sharing options...
jagnut66 Posted August 31, 2021 Author Report Share Posted August 31, 2021 On 29/08/2021 at 09:59, Colin Lindsay said: I've just looked at a number of US Heralds in 'For Sale' Ads and they all appear to have the temp gauge at the 10 o'clock position to the speedo As an aside, I've no desire to drill out my dash area to fit gauges, much prefer to use the stainless console available. It also keeps the dash original looking. Though saying that, I have now ordered a nice Burr Elm replacement for my 'rising' veneer. There were already speaker holes in the footwell panels, so I got something similar to the old fashioned speaker cloth and gave them a retro look. Best wishes, Mike. 1 Link to comment Share on other sites More sharing options...
Peter Truman Posted September 1, 2021 Report Share Posted September 1, 2021 Well I stuffed it, eons ago I replaced the original Smiths temperature sender on the Vitesse as it was steel bodied construction and was looking a little worse for wear, I put in a herald one and the gauge ever since has shown 3/4 range. Anyway on the local Aus ebay there was a Stag one for sale which equates to the GTR108, but I buggered the installation as I thought the tapped thread in the pump body was 3/8in NPT (18TPI), so I ran the NPT tap down the thread to clean it only by hand, relatively easy it was! when I fitted the new sender it was loose but held and appeared OK with ptfe plumbers string (not tape), Na didn't like it so I searched for a 3/8in male NPT to 5/8in UNF adapter (18TPI too), there hard to find, the opposite configeration is easy, finally found one locally at a reasonable cost it was delivered in 2 days even with lock down, the male NPT adapters end locked up easily in the pump body with no tape, and the adapters 5/8in UNF female end with internal tapered seat sealed tight on the senders tapered seat, all fixed Phew!. I should of checked before jumping in!!! The new sender sits half way on the gauge, thank goodness considering the buggering around. Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 1, 2021 Report Share Posted September 1, 2021 here some specs from Caerbont automotive (Smiths) Part Number Range Description OE Part No Application TT1003-38B IND 3/8"BSP THREAD,1/4" LUCAR TERMINAL TT1201-2N IND 1/2 NPTF DATCON LOW EARTH RETURN TT1201-38N IND 3/8 NPTF DATCON LOW EARTH RETURN TT1201-4N IND 1/4 NPTF DATCON LOW EARTH RETURN TT1201-8N IND 1/8 NPTF DATCON LOW EARTH RETURN TT1203-2N IND 1/2 NPTF 240-33R EARTH RETURN TT1203-38N IND 3/8 NPTF 240-33R EARTH RETURN TT1307-2N IND 1/2"NPTF 60-165 DEG.C 10X32 UNF STUD 658054 TT1307-8N IND 1/8" NPTF 60-165 DEG.C 10X32 UNF THREAD 694003 TT2001-2N IND 1/2 NPTF 240-33R INSULATED RETURN TT3001-38N INTL 40-120C 3/8 NPTF 287-23 Ohms M12GTO TT3001-58U INTL 40-120C 5/8 UNF 287-23 Ohms TT3001-8N INTL 40-120C 1/8-27NPT 287-23 Ohms TT3001-M10 INTL 40-120C M10 THREAD LUCAR 287-23 Ohms TT3005-38N INTL 50-150 C 3/8 NPTF 323-18.6 Ohms TT3005-58U INTL 50-150 C 5/8 UNF 323-18.6 Ohms TT3005-8N INTL 50-150C 1/8-27NPT 323-18.6 Ohms TT3005-M10 INTL 50-150C M10 323-18.6 Ohms TT3005-M14 INTL 50-150C M14 323-18.6 Ohms 90261059 TT4001-M14 OTHER M14 x 1.5 VDO MATCH INSULATED RTN TT4802-00A JAGUAR 5/8 UNF BIM 40-120 C NJ962 TT4803-00A CLASSIC 5/8 UNF FLAT SEATING.BI METAL RESISTANCE DAC2583 TT4803-01 OTHER TEMP SEND 5/8 18UNF 38-56091 TT4803-04 OTHER TEMP TRANSMITTER 6U-6374 TT4806-00 OTHER 2/8 18UNF 70.017 TT4815-00 OTHER TEMP. TRANSMITTER PRC4372 TT4816-00 OTHER 1/2" NPTF THREAD.2 X6.35mm. BLADE CONNECTORS U0034604 TT5803-00 OTHER TEMP TRANSMITTER 600413 TT6001-M12 MARINE TEMP SENDER M12 THREAD IR DSO/110/0/A/B TT6805-00 OTHER TEMP SEND 5/8 18 UNF 6200281000 TT6809-00 OTHER TEMP.TRANSMITTER ACU7450 TT6811-01 CLASSIC 1/8 NPTF 230-33 Ohms TT6811-03 CATERHAM 1/8 NPTF 1158-44 ohms B 71167 TT6811-04 OTHER AIR CORED 9079253 TT6811-06 OTHER TEMP TRANSMITTER 7723470 TT6818-00 OTHER TEMP TRANSDUCER A082N4040 TT6820-00 OTHER PT1000 SENDER 5.7DIA X 40 LONG.3.5MCABLE Link to comment Share on other sites More sharing options...
Colin Posted September 7, 2021 Report Share Posted September 7, 2021 Thanks, JagNut Mike! That's very helpful! 😉 Best, Colin (Winn). Link to comment Share on other sites More sharing options...
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